Foundations of Control Engineering Short Title: Found. Control Eng. Publisher: Wydawnictwo Politechniki Poznańskiej, Poznán Successor: Foundations of Computing and Decision Sciences Comments: Journal; No longer indexed Documents Indexed: 238 Publications (1975–1990) all top 5 Latest Issues 15, No. 1 (1990) 14, No. 4 (1989) 14, No. 3 (1989) 14, No. 2 (1989) 14, No. 1 (1989) 13, No. 4 (1988) 13, No. 3 (1988) 13, No. 2 (1988) 13, No. 1 (1988) 12, No. 4 (1987) 12, No. 3 (1987) 12, No. 2 (1987) 12, No. 1 (1987) 11 (1986) 10 (1985) 9 (1984) 8 (1983) 7 (1982) 6 (1981) 5 (1980) 4 (1979) 3 (1978) 2 (1977/1978) 1 (1975/1976) all top 5 Authors 25 Kaczorek, Tadeusz 7 Mikolajczak, Boleslaw 7 Păun, Gheorghe 6 Błażewicz, Jacek 6 Gomes, Luiz Flávio Autran Monteiro 6 Stoklosa, Janusz 6 Tzafestas, Spyros G. 5 Miadowicz, Zdzislaw B. 5 Słowiński, Roman 4 Busłowicz, Mikołaj 4 Calude, Cristian S. 4 Grzymala-Busse, Jerzy W. 4 Klamka, Jerzy 4 Świerkosz, Marek 4 Węglarz, Jan 3 Assimakopoulos, Nikitas A. 3 Climaco, Joao Carlos Namorado 3 Gécseg, Ferenc 3 Rozenberg, Grzegorz 3 Siwak, Pawel P. 3 Skulimowski, Andrzej M. J. 3 Zakowski, Wojciech 2 Bergandy, Jan 2 Beyga, Lech 2 Bien, Zofia 2 Biły, Barbara 2 Buzeţeanu, Şerban N. 2 Chitescu, Ion 2 Coffman, Edward Grady jun. 2 Czuchra, Waldemar 2 Dalik, Josef 2 Dassow, Jürgen 2 Ehrenfeucht, Andrzej 2 Gajewski, Tadeusz 2 Gheorghe, Adrian V. 2 Gössel, Michael 2 Imreh, Balázs 2 Janssens, Gerrit K. 2 Kamburowski, Jerzy 2 Królikowski, Andrzej 2 Machias, A. V. 2 Pascu, Anca Christine 2 Pawlaczyk, Boguslaw 2 Pouliezos, Anastasios D. 2 Sawik, Tadeusz J. 2 Simovici, Dan A. 2 Tanko, Jozsef 2 Theodorou, Nickolas J. 2 Vagin, Vadim Nikolaevich 2 Vianu, Victor 2 Warczynski, Jaroslaw 2 Wechler, Wolfgang 2 Żak, Stanislaw H. 1 Adler, Siegfried 1 Ameljanczyk, Andrzej 1 Anagnostou, K. E. 1 Andonie, Răzvan 1 Antunes, C. Henggeler 1 Awobamise, B. O. 1 Babeş, Anca 1 Baciu, Aurora 1 Badeva, Veneta 1 Bălănescu, Tudor 1 Bally-Dan, Ruxandra 1 Banaszuk, Andrzej 1 Bavel, Zamir 1 Bobrowski, Dobiesław A. 1 Brauers, Willem Karel M. 1 Bruno, John L. 1 Brzeziński, Jerzy 1 Bucurescu, Irina 1 Cellary, Wojciech 1 Ceterchi, Rodica 1 Chmiel, Krzysztof 1 Chwiałkowski, Michał 1 Cioara, Ecaterina 1 Ciobotaru, Sorin 1 Ciucar, G. 1 Cody, R. A. 1 Colson, Gerard 1 Cooper, Dale F. 1 Czyżak, Piotr 1 Daduna, Hans 1 Dialynas, E. N. 1 Dobosz, Michal 1 Drozdowski, Maciej 1 Dumitrescu, Camelia 1 Dzieliński, Andrzej 1 Ecker, Klaus H. 1 Edwards, William R. jun. 1 Eremia, Mircea 1 Ésik, Zoltán 1 Ferenci, Ferenc 1 Fiala, Petr 1 Foltyńska, Izabela 1 Gheorghe, Marian 1 Górecki, Henryk 1 Grodzki, Zdzisław 1 Harvey, Richard T. 1 Haupt, Reinhard ...and 86 more Authors all top 5 Fields 102 Computer science (68-XX) 70 Operations research, mathematical programming (90-XX) 68 Systems theory; control (93-XX) 12 Mathematical logic and foundations (03-XX) 11 Ordinary differential equations (34-XX) 11 Probability theory and stochastic processes (60-XX) 11 Numerical analysis (65-XX) 9 Game theory, economics, finance, and other social and behavioral sciences (91-XX) 9 Information and communication theory, circuits (94-XX) 8 Linear and multilinear algebra; matrix theory (15-XX) 7 Statistics (62-XX) 6 Calculus of variations and optimal control; optimization (49-XX) 6 Mechanics of particles and systems (70-XX) 5 Group theory and generalizations (20-XX) 3 General topology (54-XX) 2 Partial differential equations (35-XX) 1 General algebraic systems (08-XX) 1 Number theory (11-XX) 1 Field theory and polynomials (12-XX) 1 Category theory; homological algebra (18-XX) 1 Measure and integration (28-XX) 1 Dynamical systems and ergodic theory (37-XX) 1 Difference and functional equations (39-XX) 1 Integral transforms, operational calculus (44-XX) 1 Integral equations (45-XX) 1 Functional analysis (46-XX) 1 Convex and discrete geometry (52-XX) Publications by Year all cited Publications top 5 cited Publications Citations contained in zbMATH Open 52 Publications have been cited 140 times in 135 Documents Cited by ▼ Year ▼ An implicit enumeration algorithm for the time/cost tradeoff problem in project network analysis. Zbl 0424.90035Harvey, Richard T.; Patterson, James H. 16 1979 TRIMAP - an interactive tricriteria linear programming package. Zbl 0623.90042Climaco, João C. N.; Henggeler Antunes, C. 11 1987 Control in resource allocation systems. Zbl 0441.68033Weglarz, Jan 9 1980 Task sequencing in a batch environment with setup times. Zbl 0406.90031Bruno, John; Sethi, Ravi 7 1978 The Trident approach to rank alternative tenders for large engineering projects. Zbl 0595.90046Tavares, Luis Valadares 7 1984 A computational study of the weighted independent set problem for general graphs. Zbl 0652.68076Kopf, Roland; Ruhe, Günther 6 1987 Analyse de systèmes de decision multicritère en univers aléatoire. Zbl 0543.90065Siskos, Jean 5 1983 Parallel communicating grammar systems: The context-free case. Zbl 0796.68136Pǎun, Gheorghe 4 1989 Deadline scheduling of tasks - a survey. Zbl 0362.68087Blazewicz, Jacek 4 1976 A note on serial and parallel heuristics for resource-constrained project scheduling. Zbl 0372.90061Cooper, Dale F. 4 1977 A node ordering heuristic for network scheduling under multiple resource constraints. Zbl 0384.90050Slowinski, Roman 4 1978 On the effect of the finite index restriction on several families of grammars. II: Context dependent systems and grammars. Zbl 0415.68034Rozenberg, G.; Vermeir, D. 4 1978 Norm scalarization and proper efficiency in vector optimization. Zbl 0613.90086Kaliszewski, Ignacy 4 1986 Discrete-time quadratic optimal control of gas network systems. Zbl 0699.49036Niepłocha, Jarosław 3 1988 Feedback deadbeat control of 2-dimensional systems. Zbl 0595.93033Tzafestas, S. G.; Theodorou, N. J. 3 1984 Structure of the input monoid automaton. Zbl 0516.68046Edwards, William R. jun.; Bavel, Zamir 2 1982 Random strings according to A.N. Kolmogorov and P. Martin-Loef classical approach. Zbl 0521.03024Calude, Cristian; Chitescu, Ion 2 1982 Some properties of binary sequences useful for proving Collatz’s conjecture. Zbl 0547.10006Błażewicz, Jacek; Pettorossi, Alberto 2 1983 Controllability of M-dimensional linear systems. Zbl 0562.93049Klamka, Jerzy 2 1983 Scheduling nonpreemptible dependent operations of unequal processing times on nonidentical machines - a state space approach. Zbl 0502.90047Sawik, Tadeusz J. 2 1982 Two-dimensional cutting problem basic complexity results and algorithms for irregular shapes. Zbl 0709.90680Blazewicz, Jacek; Drozdowski, Maciej; Soniewicki, Boleslaw; Walkowiak, Rafal 2 1989 Complete classes of automata for the \(\alpha _ 1\)-product. Zbl 0629.68059Ésik, Zoltán 2 1986 A critical path algorithm for scheduling a batch-type production on nonidentical machines. Zbl 0634.90032Sawik, Tadeusz J. 2 1987 Deadbeat servo problem for large scale discrete-time linear systems. Zbl 0592.93002Kaczorek, Tadeusz 2 1985 Bounds in temporal analysis of stochastic networks. Zbl 0595.90043Kamburowski, Jerzy 2 1985 The skeleton method in multicriteria problems. Zbl 0605.90116Wiȩcek, Małgorzata 2 1984 On the computational complexity of the shortest route and maximum flow problems in stochastic networks. Zbl 0616.90016Kamburowski, Jerzy 2 1986 Cooperating/distributed grammar systems with registers. Zbl 0739.68055Dassow, Jürgen; Pǎun, Gheorge 1 1990 Characterization of the category of connected machines. Zbl 0539.68048Novotný, Miroslav 1 1982 Multiobjective and stochastic linear programming. Zbl 0544.90082Teghem, Jacques jun. 1 1983 Eigenvalue problem for the singular Roesser model. Zbl 0699.93057Kaczorek, Tadeusz; Świerkosz, Marek 1 1989 Generative grammars for some economical activities (scheduling and marshalling problems). Zbl 0363.68119Paun, Gheorghe 1 1977 Generative devices of the driver manoeuvres. Zbl 0363.68120Scortaru, Monica 1 1977 A formal linguistic approach to the production process. Zbl 0366.68058Paun, Gheorghe 1 1976 Optimal and heuristic procedures for project scheduling with multiple constrained resources - a survey. Zbl 0373.90032Slowinski, Roman 1 1977 On the strongly related automata. Zbl 0389.68031Grzymala-Busse, Jerzy W. 1 1978 A note on closure properties of R-fuzzy events. Zbl 0397.68070Wechler, Wolfgang 1 1978 Computing with scattered context grammars with regular restrictions. Zbl 0399.68075Simovici, Dan A. 1 1978 On the complexity of program divergence. Zbl 0411.68018Istrail, Sorin 1 1979 On arithmetic substitutions of EDTOL languages. Zbl 0421.68072Ehrenfeucht, A.; Rozenberg, G. 1 1979 Controllability and observability problems for linear functionaldifferential systems. Zbl 0432.93006Olbrot, Andrzej W.; Zak, Stanislaw H. 1 1980 A result on the structure of ETOL languages. Zbl 0436.68052Ehrenfeucht, A.; Rozenberg, G. 1 1979 Context-sensitive languages and Ackermann’s function. Zbl 0463.68071Simovici, Dan A. 1 1980 Interactive multiobjective optimization based on outranking and ordinal regression. Zbl 0708.90074Słowiński, Roman 1 1989 Expert control through decision making. Zbl 0709.93515Tzafestas, Spyros; Ligeza, Antoni 1 1988 Conditional local asymptotic normality for nonergodic diffusion processes. Zbl 0631.62094Veres, Sándor 1 1987 Random sequences according to P. Martin-Löf. Zbl 0632.03041Calude, Cristian; Chiţescu, Ion 1 1987 Ackermann-Péter’s function has primitive recursive graph and range. Zbl 0593.68056Tătărâm, Sanda-Monica 1 1984 Robustness analysis of control systems by means of a structured uncertainty description. Zbl 0598.93018Lunze, Jan 1 1985 Functions having the graph in the \(n\)-th Grzegorczyk class. Zbl 0625.03020Buzeţeanu, Şerban; Calude, Cristian 1 1986 A comparison of \(\alpha _ i\)-products and \(\nu _ i\)-products. Zbl 0638.68049Gécseg, Ferenc; Imreh, Balázs 1 1987 A sufficient condition for \(\Theta\)-minimality of distance scalarization procedures. Zbl 0662.90080Skulimowski, Andrzej M. J. 1 1988 Cooperating/distributed grammar systems with registers. Zbl 0739.68055Dassow, Jürgen; Pǎun, Gheorge 1 1990 Parallel communicating grammar systems: The context-free case. Zbl 0796.68136Pǎun, Gheorghe 4 1989 Two-dimensional cutting problem basic complexity results and algorithms for irregular shapes. Zbl 0709.90680Blazewicz, Jacek; Drozdowski, Maciej; Soniewicki, Boleslaw; Walkowiak, Rafal 2 1989 Eigenvalue problem for the singular Roesser model. Zbl 0699.93057Kaczorek, Tadeusz; Świerkosz, Marek 1 1989 Interactive multiobjective optimization based on outranking and ordinal regression. Zbl 0708.90074Słowiński, Roman 1 1989 Discrete-time quadratic optimal control of gas network systems. Zbl 0699.49036Niepłocha, Jarosław 3 1988 Expert control through decision making. Zbl 0709.93515Tzafestas, Spyros; Ligeza, Antoni 1 1988 A sufficient condition for \(\Theta\)-minimality of distance scalarization procedures. Zbl 0662.90080Skulimowski, Andrzej M. J. 1 1988 TRIMAP - an interactive tricriteria linear programming package. Zbl 0623.90042Climaco, João C. N.; Henggeler Antunes, C. 11 1987 A computational study of the weighted independent set problem for general graphs. Zbl 0652.68076Kopf, Roland; Ruhe, Günther 6 1987 A critical path algorithm for scheduling a batch-type production on nonidentical machines. Zbl 0634.90032Sawik, Tadeusz J. 2 1987 Conditional local asymptotic normality for nonergodic diffusion processes. Zbl 0631.62094Veres, Sándor 1 1987 Random sequences according to P. Martin-Löf. Zbl 0632.03041Calude, Cristian; Chiţescu, Ion 1 1987 A comparison of \(\alpha _ i\)-products and \(\nu _ i\)-products. Zbl 0638.68049Gécseg, Ferenc; Imreh, Balázs 1 1987 Norm scalarization and proper efficiency in vector optimization. Zbl 0613.90086Kaliszewski, Ignacy 4 1986 Complete classes of automata for the \(\alpha _ 1\)-product. Zbl 0629.68059Ésik, Zoltán 2 1986 On the computational complexity of the shortest route and maximum flow problems in stochastic networks. Zbl 0616.90016Kamburowski, Jerzy 2 1986 Functions having the graph in the \(n\)-th Grzegorczyk class. Zbl 0625.03020Buzeţeanu, Şerban; Calude, Cristian 1 1986 Deadbeat servo problem for large scale discrete-time linear systems. Zbl 0592.93002Kaczorek, Tadeusz 2 1985 Bounds in temporal analysis of stochastic networks. Zbl 0595.90043Kamburowski, Jerzy 2 1985 Robustness analysis of control systems by means of a structured uncertainty description. Zbl 0598.93018Lunze, Jan 1 1985 The Trident approach to rank alternative tenders for large engineering projects. Zbl 0595.90046Tavares, Luis Valadares 7 1984 Feedback deadbeat control of 2-dimensional systems. Zbl 0595.93033Tzafestas, S. G.; Theodorou, N. J. 3 1984 The skeleton method in multicriteria problems. Zbl 0605.90116Wiȩcek, Małgorzata 2 1984 Ackermann-Péter’s function has primitive recursive graph and range. Zbl 0593.68056Tătărâm, Sanda-Monica 1 1984 Analyse de systèmes de decision multicritère en univers aléatoire. Zbl 0543.90065Siskos, Jean 5 1983 Some properties of binary sequences useful for proving Collatz’s conjecture. Zbl 0547.10006Błażewicz, Jacek; Pettorossi, Alberto 2 1983 Controllability of M-dimensional linear systems. Zbl 0562.93049Klamka, Jerzy 2 1983 Multiobjective and stochastic linear programming. Zbl 0544.90082Teghem, Jacques jun. 1 1983 Structure of the input monoid automaton. Zbl 0516.68046Edwards, William R. jun.; Bavel, Zamir 2 1982 Random strings according to A.N. Kolmogorov and P. Martin-Loef classical approach. Zbl 0521.03024Calude, Cristian; Chitescu, Ion 2 1982 Scheduling nonpreemptible dependent operations of unequal processing times on nonidentical machines - a state space approach. Zbl 0502.90047Sawik, Tadeusz J. 2 1982 Characterization of the category of connected machines. Zbl 0539.68048Novotný, Miroslav 1 1982 Control in resource allocation systems. Zbl 0441.68033Weglarz, Jan 9 1980 Controllability and observability problems for linear functionaldifferential systems. Zbl 0432.93006Olbrot, Andrzej W.; Zak, Stanislaw H. 1 1980 Context-sensitive languages and Ackermann’s function. Zbl 0463.68071Simovici, Dan A. 1 1980 An implicit enumeration algorithm for the time/cost tradeoff problem in project network analysis. Zbl 0424.90035Harvey, Richard T.; Patterson, James H. 16 1979 On the complexity of program divergence. Zbl 0411.68018Istrail, Sorin 1 1979 On arithmetic substitutions of EDTOL languages. Zbl 0421.68072Ehrenfeucht, A.; Rozenberg, G. 1 1979 A result on the structure of ETOL languages. Zbl 0436.68052Ehrenfeucht, A.; Rozenberg, G. 1 1979 Task sequencing in a batch environment with setup times. Zbl 0406.90031Bruno, John; Sethi, Ravi 7 1978 A node ordering heuristic for network scheduling under multiple resource constraints. Zbl 0384.90050Slowinski, Roman 4 1978 On the effect of the finite index restriction on several families of grammars. II: Context dependent systems and grammars. Zbl 0415.68034Rozenberg, G.; Vermeir, D. 4 1978 On the strongly related automata. Zbl 0389.68031Grzymala-Busse, Jerzy W. 1 1978 A note on closure properties of R-fuzzy events. Zbl 0397.68070Wechler, Wolfgang 1 1978 Computing with scattered context grammars with regular restrictions. Zbl 0399.68075Simovici, Dan A. 1 1978 A note on serial and parallel heuristics for resource-constrained project scheduling. Zbl 0372.90061Cooper, Dale F. 4 1977 Generative grammars for some economical activities (scheduling and marshalling problems). Zbl 0363.68119Paun, Gheorghe 1 1977 Generative devices of the driver manoeuvres. Zbl 0363.68120Scortaru, Monica 1 1977 Optimal and heuristic procedures for project scheduling with multiple constrained resources - a survey. Zbl 0373.90032Slowinski, Roman 1 1977 Deadline scheduling of tasks - a survey. Zbl 0362.68087Blazewicz, Jacek 4 1976 A formal linguistic approach to the production process. Zbl 0366.68058Paun, Gheorghe 1 1976 all cited Publications top 5 cited Publications all top 5 Cited by 200 Authors 4 Błażewicz, Jacek 4 Henggeler Antunes, Carlos 4 Pardalos, Panos M. 3 Alves, Maria João 3 Batsyn, Mikhail V. 3 Calude, Cristian S. 3 Climaco, Joao Carlos Namorado 3 Fernau, Henning 3 Jank, Gerhard 3 Maslov, Evgeny 3 Ozdamar, Linet 3 Rozenberg, Grzegorz 3 Sawik, Tadeusz J. 3 Węglarz, Jan 2 Antunes, C. Henggeler 2 Azevedo-Perdicoúlis, Teresa Paula 2 Costa, João Paulo 2 Ding, Steven X. 2 Divakaran, Srikrishnan 2 Drexl, Andreas 2 Ehrenfeucht, Andrzej 2 Ésik, Zoltán 2 Galperin, Efim A. 2 Gécseg, Ferenc 2 Ghosh, Jay B. 2 Kari, Jarkko 2 Kolisch, Rainer 2 Li, Yueyang 2 Lopes dos Santos, Paulo 2 Păun, Gheorghe 2 Różycki, Rafał 2 Saks, Michael E. 2 Słowiński, Roman 2 Taheri, Seyyed Hassan 2 Tareghian, Hamed Reza 2 Tavares, L. Valadares 2 Theodorou, Nickolas J. 2 Tzafestas, Spyros G. 2 Ulusoy, Gündüz 2 Vanhoucke, Mario 2 Vermeir, Dirk 2 Wallace, Stein W. 2 Zaras, Kazimierz 2 Zhao, Dong 1 Agell, Núria 1 Ahn, Choon Ki 1 Akkan, Can 1 Alaya, Jilani 1 Asveld, Peter R. J. 1 Atia, Mohamed Jalel 1 Azevedo-Perdicoúlisr, T.-P. 1 Azizoglu, Meral 1 Bavel, Zamir 1 Bennell, Julia A. 1 Boctor, Fayer F. 1 Boctor, Fayez Fouad 1 Borges, Ana Rosa 1 Boţ, Radu Ioan 1 Bouras, Belgacem 1 Bregman, Robert L. 1 Brucker, Peter J. 1 Camacho, Eduardo Fernández 1 Câmpeanu, Cezar 1 Chanas, Stefan 1 Chen, Borsen 1 Chen, Ye-Hwa 1 Chitescu, Ion 1 Coelho, Dulce 1 Creemers, Stefan 1 Daniels, Richard L. 1 D’Avignon, Gilles R. 1 De, Prabuddha 1 Debels, Dieter 1 Dömösi, Pál 1 Dündar, Hakan 1 Dunne, E. James 1 Dunstall, Simon 1 Dzieliński, Andrzej 1 Edwards, William R. jun. 1 Engelfriet, Joost 1 Fang, Chen 1 Fathi, Yahya 1 Finke, Gerd 1 Freund, Rudolf 1 Fruhwirth, Bernd 1 Gardiner, Lorraine R. 1 Gassmann, Horand I. 1 Gerodimos, Alex E. 1 Geunes, Joseph 1 Ghaderi, Mohammad 1 Glass, Celia A. Dr. 1 Goldengorin, Boris I. 1 Golovkin, B. A. 1 Gonçalves, José Fernando 1 Govindan, Kannan 1 Grad, Sorin-Mihai 1 Greenblatt, Bruce 1 Grigorev, Aleksandr 1 Grzymala-Busse, Jerzy W. 1 Gupta, Jatinder N. D. ...and 100 more Authors all top 5 Cited in 40 Journals 45 European Journal of Operational Research 12 Theoretical Computer Science 7 Computers & Operations Research 6 Annals of Operations Research 5 Information Processing Letters 5 Kybernetika 4 Automatica 4 Journal of Global Optimization 3 Operations Research Letters 2 Discrete Applied Mathematics 2 Journal of the Franklin Institute 2 Applied Mathematics and Computation 2 Journal of Computer and System Sciences 2 Mathematics and Computers in Simulation 2 Mathematical Systems Theory 2 RAIRO, Informatique Théorique 2 International Journal of Production Research 2 Multidimensional Systems and Signal Processing 2 International Transactions in Operational Research 1 Acta Informatica 1 Computers & Mathematics with Applications 1 International Journal of Control 1 Czechoslovak Mathematical Journal 1 Fuzzy Sets and Systems 1 International Journal of Mathematics and Mathematical Sciences 1 Journal of Optimization Theory and Applications 1 Journal of Soviet Mathematics 1 Theory and Decision 1 Algorithmica 1 Applied Mathematical Modelling 1 Stochastic Processes and their Applications 1 Mathematical Problems in Engineering 1 Mathematical Methods of Operations Research 1 Journal of Combinatorial Optimization 1 Journal of Scheduling 1 Discrete Dynamics in Nature and Society 1 International Journal of Applied Mathematics and Computer Science 1 Journal of Applied Mathematics 1 JP Journal of Algebra, Number Theory and Applications 1 Computational Management Science all top 5 Cited in 18 Fields 87 Operations research, mathematical programming (90-XX) 39 Computer science (68-XX) 13 Systems theory; control (93-XX) 10 Game theory, economics, finance, and other social and behavioral sciences (91-XX) 4 Calculus of variations and optimal control; optimization (49-XX) 4 Numerical analysis (65-XX) 3 Mathematical logic and foundations (03-XX) 2 Combinatorics (05-XX) 2 Number theory (11-XX) 2 Group theory and generalizations (20-XX) 1 General algebraic systems (08-XX) 1 Field theory and polynomials (12-XX) 1 Category theory; homological algebra (18-XX) 1 Real functions (26-XX) 1 Probability theory and stochastic processes (60-XX) 1 Statistics (62-XX) 1 Mechanics of particles and systems (70-XX) 1 Information and communication theory, circuits (94-XX) Citations by Year