Edit Profile (opens in new tab) Fernández-Alcober, Gustavo A. Co-Author Distance Author ID: fernandez-alcober.gustavo-a Published as: Fernández-Alcober, Gustavo A.; Fernández-Alcober, G. A.; Fernández-Alcober, Gustavo more...less Documents Indexed: 56 Publications since 1991, including 1 Additional arXiv Preprint Co-Authors: 33 Co-Authors with 52 Joint Publications 316 Co-Co-Authors all top 5 Co-Authors 3 single-authored 10 Legarreta, Leire 6 Shumyatsky, Pavel 5 Tortora, Antonio 5 Tota, Maria 5 Vera-López, Antonio 4 Moretó, Alexander 4 Morigi, Marta 4 Noce, Marialaura 3 Acciarri, Cristina 3 Gül, Şükran 3 Zugadi-Reizabal, Amaia 2 Di Domenico, Elena 2 Gavioli, Norberto 2 González-Sánchez, Jon 2 Pintonello, Matteo 2 Thillaisundaram, Anitha 2 Vannacci, Matteo 1 Babai, Azam 1 de las Heras, Iker 1 Egizii di Marco, Manuel 1 Fathalikhani, Khadijeh 1 Garciarena, Mikel E. 1 Garreta, Albert 1 Garrido, Alejandra 1 Giannelli, Eugenio 1 Jaikin-Zapirain, Andrei 1 Jezernik, Urban 1 Kazachkov, Ilya V. 1 Kwashira, Rugare 1 Remeslennikov, Vladimir Nikanorovich 1 Scoppola, Carlo Maria 1 Shepherd, Raymond T. 1 Symonds, Peter 1 Tracey, Gareth M. 1 Traustason, Gunnar 1 Uria-Albizuri, Jone all top 5 Serials 9 Journal of Algebra 6 Israel Journal of Mathematics 6 Journal of Group Theory 5 Monatshefte für Mathematik 4 Communications in Algebra 3 Proceedings of the American Mathematical Society 2 Transactions of the American Mathematical Society 2 Journal of the Iranian Mathematical Society 1 Bulletin of the Australian Mathematical Society 1 Mathematical Proceedings of the Cambridge Philosophical Society 1 Archiv der Mathematik 1 Journal of the London Mathematical Society. Second Series 1 Proceedings of the London Mathematical Society. Third Series 1 European Journal of Combinatorics 1 Glasnik Matematički. Serija III 1 St. Petersburg Mathematical Journal 1 Matemática Contemporânea 1 The Quarterly Journal of Mathematics 1 Journal of the Australian Mathematical Society 1 Mediterranean Journal of Mathematics 1 Groups, Geometry, and Dynamics all top 5 Fields 55 Group theory and generalizations (20-XX) 3 Algebraic geometry (14-XX) 3 Measure and integration (28-XX) 1 Mathematical logic and foundations (03-XX) 1 Combinatorics (05-XX) 1 Number theory (11-XX) Publications by Year all cited Publications top 5 cited Publications Citations contained in zbMATH Open 42 Publications have been cited 323 times in 221 Documents Cited by ▼ Year ▼ GGS-groups: order of congruence quotients and Hausdorff dimension. Zbl 1317.20029 Fernández-Alcober, Gustavo A.; Zugadi-Reizabal, Amaia 28 2014 Omega subgroups of pro-\(p\) groups. Zbl 1153.20028 Fernández-Alcober, Gustavo A.; González-Sánchez, Jon; Jaikin-Zapirain, Andrei 28 2008 Outer commutator words are uniformly concise. Zbl 1227.20032 Fernández-Alcober, G. A.; Morigi, M. 28 2010 Groups with two extreme character degrees and their normal subgroups. Zbl 0968.20005 Fernández-Alcober, Gustavo A.; Moretó, Alexander 21 2001 On the congruence subgroup property for GGS-groups. Zbl 1431.20017 Fernández-Alcober, Gustavo A.; Garrido, Alejandra; Uria-Albizuri, Jone 19 2017 An introduction to finite \(p\)-groups: regular \(p\)-groups and groups of maximal class. Zbl 1012.20014 Fernández-Alcober, Gustavo A. 17 2001 Beauville structures in finite \(p\)-groups. Zbl 1383.20015 Fernández-Alcober, Gustavo A.; Gül, Şükran 12 2017 On bounded conciseness of words in residually finite groups. Zbl 1427.20038 Fernández-Alcober, Gustavo A.; Shumyatsky, Pavel 12 2018 The finite \(p\)-groups with \(p\) conjugacy classes of non-normal subgroups. Zbl 1215.20018 Fernández-Alcober, Gustavo A.; Legarreta, Leire 11 2010 A note on conciseness of Engel words. Zbl 1261.20033 Fernández-Alcober, Gustavo A.; Morigi, Marta; Traustason, Gunnar 10 2012 Cyclotomy over products of finite fields and combinatorial applications. Zbl 1225.05250 Fernández-Alcober, Gustavo A.; Kwashira, Rugare; Martínez, Luis 10 2010 Generalizing a theorem of P. Hall on finite-by-nilpotent groups. Zbl 1165.20026 Fernández-Alcober, Gustavo A.; Morigi, Marta 9 2009 A focal subgroup theorem for outer commutator words. Zbl 1282.20019 Acciarri, Cristina; Fernández-Alcober, Gustavo A.; Shumyatsky, Pavel 9 2012 On groups in which commutators are covered by finitely many cyclic subgroups. Zbl 1154.20031 Fernández-Alcober, Gustavo A.; Shumyatsky, Pavel 9 2008 Omega subgroups of powerful \(p\)-groups. Zbl 1147.20015 Fernández-Alcober, Gustavo A. 9 2007 The exact lower bound for the degree of commutativity of a \(p\)-group of maximal class. Zbl 0835.20030 Fernández-Alcober, Gustavo A. 8 1995 Conjugacy classes of non-normal subgroups in finite nilpotent groups. Zbl 1182.20019 Fernández-Alcober, Gustavo A.; Legarreta, Leire 7 2008 On the number of conjugacy class sizes and character degrees in finite \(p\)-groups. Zbl 0981.20003 Fernández-Alcober, Gustavo A.; Moretó, Alexander 6 2001 Comparison of the discrete and continuous cohomology groups of a pro-\(p\) group. Zbl 1206.20058 Fernández-Alcober, G. A.; Kazachkov, I. V.; Remeslennikov, V. N.; Symonds, P. 6 2008 Commutators in finite \(p\)-groups with 2-generator derived subgroup. Zbl 1439.20032 Fernández-Alcober, Gustavo A.; de las Heras, Iker 6 2019 A restriction on centralizers in finite groups. Zbl 1300.20027 Fernández-Alcober, Gustavo A.; Legarreta, Leire; Tortora, Antonio; Tota, Maria 5 2014 Some restrictions on normalizers or centralizers in finite \(p\)-groups. Zbl 1334.20016 Fernández-Alcober, Gustavo A.; Legarreta, Leire; Tortora, Antonio; Tota, Maria 5 2015 Spinal groups: semidirect product decompositions and Hausdorff dimension. Zbl 1251.20028 Fernández-Alcober, Gustavo A.; Zugadi-Reizabal, Amaia 5 2011 On \(p\)-groups of maximal class. III. Zbl 0743.20014 Vera-López, Antonio; Fernández-Alcober, Gustavo A. 4 1991 Engel elements in some fractal groups. Zbl 1453.20039 Fernández-Alcober, Gustavo A.; Garreta, Albert; Noce, Marialaura 4 2019 A finiteness condition on centralizers in locally nilpotent groups. Zbl 1364.20019 Fernández-Alcober, Gustavo A.; Legarreta, Leire; Tortora, Antonio; Tota, Maria 3 2017 Hausdorff dimension in \(R\)-analytic profinite groups. Zbl 1395.20016 Fernández-Alcober, Gustavo A.; Giannelli, Eugenio; González-Sánchez, Jon 3 2017 On \(p\)-groups of maximal class. II. Zbl 0737.20010 Vera-López, Antonio; Fernández-Alcober, Gustavo A. 3 1991 A finiteness condition on centralizers in locally finite groups. Zbl 1376.20038 Fernández-Alcober, Gustavo A.; Legarreta, Leire; Tortora, Antonio; Tota, Maria 3 2017 On self-similar finite \(p\)-groups. Zbl 1528.20018 Babai, Azam; Fathalikhani, Khadijeh; Fernández-Alcober, Gustavo A.; Vannacci, Matteo 3 2020 GGS-groups over primary trees: branch structures. Zbl 1522.20101 Di Domenico, E.; Fernández-Alcober, G. A.; Gavioli, N. 3 2023 On the asymptotic behaviour of the number of Beauville and non-Beauville \(p\)-groups. Zbl 1481.20067 Fernández-Alcober, Gustavo A.; Gül, Şükran; Vannacci, Matteo 3 2020 \(p\)-Basilica groups. Zbl 1547.20096 Di Domenico, Elena; Fernández-Alcober, Gustavo A.; Noce, Marialaura; Thillaisundaram, Anitha 3 2022 Engel elements in weakly branch groups. Zbl 1452.20034 Fernández-Alcober, Gustavo A.; Noce, Marialaura; Tracey, Gareth M. 3 2020 A finiteness condition on normal subgroups of nilpotent groups. Zbl 1002.20018 Fernández-Alcober, Gustavo A.; Moretó, Alexander 2 2002 The conjugacy vector of a \(p\)-group of maximal class. Zbl 0824.20021 Vera-López, Antonio; Fernández-Alcober, Gustavo A. 2 1994 On the order of \(p\)-groups of abundance zero. Zbl 0932.20013 Fernández-Alcober, Gustavo A.; Shepherd, Raymond T. 2 1998 Conciseness on normal subgroups and new concise words from lower central and derived words. Zbl 1535.20158 Fernández-Alcober, G. A.; Pintonello, M. 2 2023 Bogomolov multipliers of \(p\)-groups of maximal class. Zbl 1481.20068 Fernández-Alcober, Gustavo A.; Jezernik, Urban 2 2020 Procyclic coverings of commutators in profinite groups. Zbl 1305.20035 Fernández-Alcober, Gustavo A.; Morigi, Marta; Shumyatsky, Pavel 1 2014 Counting conjugacy classes of subgroups in finite \(p\)-groups. I. Zbl 1160.20014 Fernández-Alcober, Gustavo A.; Legarreta, Leire 1 2007 Some finiteness conditions on normalizers or centralizers in groups. Zbl 1392.20022 Fernández-Alcober, Gustavo A.; Legarreta, Leire; Tortora, Antonio; Tota, Maria 1 2018 GGS-groups over primary trees: branch structures. Zbl 1522.20101 Di Domenico, E.; Fernández-Alcober, G. A.; Gavioli, N. 3 2023 Conciseness on normal subgroups and new concise words from lower central and derived words. Zbl 1535.20158 Fernández-Alcober, G. A.; Pintonello, M. 2 2023 \(p\)-Basilica groups. Zbl 1547.20096 Di Domenico, Elena; Fernández-Alcober, Gustavo A.; Noce, Marialaura; Thillaisundaram, Anitha 3 2022 On self-similar finite \(p\)-groups. Zbl 1528.20018 Babai, Azam; Fathalikhani, Khadijeh; Fernández-Alcober, Gustavo A.; Vannacci, Matteo 3 2020 On the asymptotic behaviour of the number of Beauville and non-Beauville \(p\)-groups. Zbl 1481.20067 Fernández-Alcober, Gustavo A.; Gül, Şükran; Vannacci, Matteo 3 2020 Engel elements in weakly branch groups. Zbl 1452.20034 Fernández-Alcober, Gustavo A.; Noce, Marialaura; Tracey, Gareth M. 3 2020 Bogomolov multipliers of \(p\)-groups of maximal class. Zbl 1481.20068 Fernández-Alcober, Gustavo A.; Jezernik, Urban 2 2020 Commutators in finite \(p\)-groups with 2-generator derived subgroup. Zbl 1439.20032 Fernández-Alcober, Gustavo A.; de las Heras, Iker 6 2019 Engel elements in some fractal groups. Zbl 1453.20039 Fernández-Alcober, Gustavo A.; Garreta, Albert; Noce, Marialaura 4 2019 On bounded conciseness of words in residually finite groups. Zbl 1427.20038 Fernández-Alcober, Gustavo A.; Shumyatsky, Pavel 12 2018 Some finiteness conditions on normalizers or centralizers in groups. Zbl 1392.20022 Fernández-Alcober, Gustavo A.; Legarreta, Leire; Tortora, Antonio; Tota, Maria 1 2018 On the congruence subgroup property for GGS-groups. Zbl 1431.20017 Fernández-Alcober, Gustavo A.; Garrido, Alejandra; Uria-Albizuri, Jone 19 2017 Beauville structures in finite \(p\)-groups. Zbl 1383.20015 Fernández-Alcober, Gustavo A.; Gül, Şükran 12 2017 A finiteness condition on centralizers in locally nilpotent groups. Zbl 1364.20019 Fernández-Alcober, Gustavo A.; Legarreta, Leire; Tortora, Antonio; Tota, Maria 3 2017 Hausdorff dimension in \(R\)-analytic profinite groups. Zbl 1395.20016 Fernández-Alcober, Gustavo A.; Giannelli, Eugenio; González-Sánchez, Jon 3 2017 A finiteness condition on centralizers in locally finite groups. Zbl 1376.20038 Fernández-Alcober, Gustavo A.; Legarreta, Leire; Tortora, Antonio; Tota, Maria 3 2017 Some restrictions on normalizers or centralizers in finite \(p\)-groups. Zbl 1334.20016 Fernández-Alcober, Gustavo A.; Legarreta, Leire; Tortora, Antonio; Tota, Maria 5 2015 GGS-groups: order of congruence quotients and Hausdorff dimension. Zbl 1317.20029 Fernández-Alcober, Gustavo A.; Zugadi-Reizabal, Amaia 28 2014 A restriction on centralizers in finite groups. Zbl 1300.20027 Fernández-Alcober, Gustavo A.; Legarreta, Leire; Tortora, Antonio; Tota, Maria 5 2014 Procyclic coverings of commutators in profinite groups. Zbl 1305.20035 Fernández-Alcober, Gustavo A.; Morigi, Marta; Shumyatsky, Pavel 1 2014 A note on conciseness of Engel words. Zbl 1261.20033 Fernández-Alcober, Gustavo A.; Morigi, Marta; Traustason, Gunnar 10 2012 A focal subgroup theorem for outer commutator words. Zbl 1282.20019 Acciarri, Cristina; Fernández-Alcober, Gustavo A.; Shumyatsky, Pavel 9 2012 Spinal groups: semidirect product decompositions and Hausdorff dimension. Zbl 1251.20028 Fernández-Alcober, Gustavo A.; Zugadi-Reizabal, Amaia 5 2011 Outer commutator words are uniformly concise. Zbl 1227.20032 Fernández-Alcober, G. A.; Morigi, M. 28 2010 The finite \(p\)-groups with \(p\) conjugacy classes of non-normal subgroups. Zbl 1215.20018 Fernández-Alcober, Gustavo A.; Legarreta, Leire 11 2010 Cyclotomy over products of finite fields and combinatorial applications. Zbl 1225.05250 Fernández-Alcober, Gustavo A.; Kwashira, Rugare; Martínez, Luis 10 2010 Generalizing a theorem of P. Hall on finite-by-nilpotent groups. Zbl 1165.20026 Fernández-Alcober, Gustavo A.; Morigi, Marta 9 2009 Omega subgroups of pro-\(p\) groups. Zbl 1153.20028 Fernández-Alcober, Gustavo A.; González-Sánchez, Jon; Jaikin-Zapirain, Andrei 28 2008 On groups in which commutators are covered by finitely many cyclic subgroups. Zbl 1154.20031 Fernández-Alcober, Gustavo A.; Shumyatsky, Pavel 9 2008 Conjugacy classes of non-normal subgroups in finite nilpotent groups. Zbl 1182.20019 Fernández-Alcober, Gustavo A.; Legarreta, Leire 7 2008 Comparison of the discrete and continuous cohomology groups of a pro-\(p\) group. Zbl 1206.20058 Fernández-Alcober, G. A.; Kazachkov, I. V.; Remeslennikov, V. N.; Symonds, P. 6 2008 Omega subgroups of powerful \(p\)-groups. Zbl 1147.20015 Fernández-Alcober, Gustavo A. 9 2007 Counting conjugacy classes of subgroups in finite \(p\)-groups. I. Zbl 1160.20014 Fernández-Alcober, Gustavo A.; Legarreta, Leire 1 2007 A finiteness condition on normal subgroups of nilpotent groups. Zbl 1002.20018 Fernández-Alcober, Gustavo A.; Moretó, Alexander 2 2002 Groups with two extreme character degrees and their normal subgroups. Zbl 0968.20005 Fernández-Alcober, Gustavo A.; Moretó, Alexander 21 2001 An introduction to finite \(p\)-groups: regular \(p\)-groups and groups of maximal class. Zbl 1012.20014 Fernández-Alcober, Gustavo A. 17 2001 On the number of conjugacy class sizes and character degrees in finite \(p\)-groups. Zbl 0981.20003 Fernández-Alcober, Gustavo A.; Moretó, Alexander 6 2001 On the order of \(p\)-groups of abundance zero. Zbl 0932.20013 Fernández-Alcober, Gustavo A.; Shepherd, Raymond T. 2 1998 The exact lower bound for the degree of commutativity of a \(p\)-group of maximal class. Zbl 0835.20030 Fernández-Alcober, Gustavo A. 8 1995 The conjugacy vector of a \(p\)-group of maximal class. Zbl 0824.20021 Vera-López, Antonio; Fernández-Alcober, Gustavo A. 2 1994 On \(p\)-groups of maximal class. III. Zbl 0743.20014 Vera-López, Antonio; Fernández-Alcober, Gustavo A. 4 1991 On \(p\)-groups of maximal class. II. Zbl 0737.20010 Vera-López, Antonio; Fernández-Alcober, Gustavo A. 3 1991 all cited Publications top 5 cited Publications all top 5 Cited by 185 Authors 37 Shumyatsky, Pavel 27 Fernández-Alcober, Gustavo A. 17 Morigi, Marta 14 Detomi, Eloisa 14 González-Sánchez, Jon 12 Thillaisundaram, Anitha 10 Gül, Şükran 8 Legarreta, Leire 8 Tortora, Antonio 8 Vera-López, Antonio 7 Tota, Maria 6 De Melo, Emerson 6 Klopsch, Benjamin 6 Noce, Marialaura 6 Uria-Albizuri, Jone 5 Acciarri, Cristina 5 Arregi, Jesus Maria 5 de Araujo Bastos, Raimundo jun. 5 Lewis, Mark L. 4 de las Heras, Iker 4 Delizia, Costantino 4 Di Domenico, Elena 4 Fairbairn, Ben Thomas 4 Garrido, Alejandra 4 Moravec, Primož 4 Moretó, Alexander 4 Petschick, Jan Moritz 4 Pintonello, Matteo 3 Garaialde Ocaña, Oihana 3 García Sánchez, M. Asun 3 Gavioli, Norberto 3 Gonçalves, Nathália Nogueira 3 Keller, Thomas Michael 3 Li, Lili 3 Monetta, Carmine 3 Prajapati, Sunil Kumar 3 Qu, Haipeng 3 Russo, Francesco Giuseppe 3 Song, Qiangwei 3 Vera López, Francisco José 3 Zugadi-Reizabal, Amaia 2 Araluze, Alexander 2 Azevedo, João Luiz F. 2 Casolo, Carlo 2 Díaz Ramos, Antonio 2 Esteban-Romero, Ramón 2 Francoeur, Dominik 2 Guralnick, Robert Michael 2 Jaikin-Zapirain, Andrei 2 Kaushik, Rahul 2 Kutnar, Klavdija 2 Lv, Heng 2 Mann, Avinoam 2 Marušič, Dragan 2 Nicotera, Chiara 2 Noseda, Francesco 2 O’Brien, Eamonn A. 2 Ott, Udo 2 Rajeev, Karthika 2 Sarkar, Siddhartha 2 Skipper, Rachel 2 Snopce, Ilir 2 Šunić, Zoran 2 Traustason, Gunnar 2 Udeep, Ayush 2 Yadav, Manoj Kumar 2 Yang, Dongfang 2 Zhang, Qinhai 1 Abdollahi, Alireza 1 An, Lijian 1 Babai, Azam 1 Bagiński, Czesław 1 Barnea, Yiftach 1 Bodart, Corentin 1 Boston, Nigel 1 Bou-Rabee, Khalid 1 Bradford, Henry 1 Brandl, Rolf 1 Burkett, Shawn T. 1 Camina, Alan R. 1 Camina, Rachel Deborah 1 Caranti, Andrea 1 Carta, Ludo 1 Cavaleri, Matteo 1 Chakaneh, Marzieh 1 Chen, Guiyun 1 Chen, Xiaoyou 1 Choudhary, Ram Karan 1 Çınarcı, Burcu 1 Conte, Martina 1 Contreras-Rojas, Yerko 1 Crespo Vicente, Teresa 1 Cutolo, Giovanni 1 da Silva Alves, Josean 1 D’angeli, Daniele 1 Dantas, Alex Carrazedo 1 Dardano, Ulderico 1 Davis, James Avery 1 Dietrich, Heiko 1 Dolfi, Silvio ...and 85 more Authors all top 5 Cited in 61 Serials 38 Journal of Algebra 17 Journal of Group Theory 14 Monatshefte für Mathematik 13 Israel Journal of Mathematics 12 Communications in Algebra 10 Archiv der Mathematik 8 Journal of Algebra and its Applications 8 International Journal of Group Theory 7 Journal of Pure and Applied Algebra 6 Bulletin of the Australian Mathematical Society 6 Groups, Geometry, and Dynamics 4 Mathematische Nachrichten 4 Proceedings of the American Mathematical Society 4 International Journal of Algebra and Computation 4 Mediterranean Journal of Mathematics 3 Advances in Mathematics 3 Journal of the London Mathematical Society. Second Series 3 Proceedings of the Edinburgh Mathematical Society. Series II 3 Transactions of the American Mathematical Society 3 Journal of the Australian Mathematical Society 2 Glasgow Mathematical Journal 2 Mathematische Annalen 2 Quaestiones Mathematicae 2 Rendiconti del Seminario Matematico della Università di Padova 2 Bulletin of the Iranian Mathematical Society 2 Designs, Codes and Cryptography 2 Journal of Algebraic Combinatorics 2 Finite Fields and their Applications 2 The Quarterly Journal of Mathematics 2 Journal of the Iranian Mathematical Society 1 Discrete Mathematics 1 Indian Journal of Pure & Applied Mathematics 1 Mathematical Proceedings of the Cambridge Philosophical Society 1 Annali di Matematica Pura ed Applicata. Serie Quarta 1 Bulletin of the London Mathematical Society 1 Canadian Mathematical Bulletin 1 Colloquium Mathematicum 1 Czechoslovak Mathematical Journal 1 Journal of Combinatorial Theory. Series A 1 Mathematische Zeitschrift 1 Pacific Journal of Mathematics 1 European Journal of Combinatorics 1 Publicacions Matemàtiques 1 Forum Mathematicum 1 Proceedings of the Royal Society of Edinburgh. Section A. Mathematics 1 Proceedings of the Indian Academy of Sciences. Mathematical Sciences 1 Expositiones Mathematicae 1 Topology Proceedings 1 Journal of Mathematical Sciences (New York) 1 European Mathematical Society Newsletter 1 Vietnam Journal of Mathematics 1 Hacettepe Journal of Mathematics and Statistics 1 Frontiers of Mathematics in China 1 Asian-European Journal of Mathematics 1 Science China. Mathematics 1 Bulletin of Mathematical Sciences 1 Forum of Mathematics, Pi 1 Advances in Group Theory and Applications 1 The Art of Discrete and Applied Mathematics 1 Combinatorial Theory 1 Frontiers of Mathematics all top 5 Cited in 22 Fields 212 Group theory and generalizations (20-XX) 14 Algebraic geometry (14-XX) 13 Combinatorics (05-XX) 8 Topological groups, Lie groups (22-XX) 5 Number theory (11-XX) 4 Measure and integration (28-XX) 4 Computer science (68-XX) 3 Associative rings and algebras (16-XX) 2 Functions of a complex variable (30-XX) 2 Abstract harmonic analysis (43-XX) 2 Algebraic topology (55-XX) 2 Manifolds and cell complexes (57-XX) 1 History and biography (01-XX) 1 Mathematical logic and foundations (03-XX) 1 Order, lattices, ordered algebraic structures (06-XX) 1 Field theory and polynomials (12-XX) 1 Commutative algebra (13-XX) 1 Nonassociative rings and algebras (17-XX) 1 \(K\)-theory (19-XX) 1 Dynamical systems and ergodic theory (37-XX) 1 Geometry (51-XX) 1 Information and communication theory, circuits (94-XX) Citations by Year