Wang, Long; Yan, Chunyu; Fang, Xianwen; Geng, Xianya; Tian, Fenglei Vertex-connectivity, chromatic number, domination number, maximum degree and Laplacian eigenvalue distribution. (English) Zbl 1458.05159 Linear Algebra Appl. 607, 307-318 (2020). MSC: 05C50 05C40 05C69 05C07 05C35 PDF BibTeX XML Cite \textit{L. Wang} et al., Linear Algebra Appl. 607, 307--318 (2020; Zbl 1458.05159) Full Text: DOI OpenURL
Neves, J.; Vaz Pinto, M.; Villarreal, R. H. Joins, ears and Castelnuovo-Mumford regularity. (English) Zbl 1448.13038 J. Algebra 560, 67-88 (2020). Reviewer: S. A. Seyed Fakhari (Tehran) MSC: 13F20 13P20 05E40 05C70 PDF BibTeX XML Cite \textit{J. Neves} et al., J. Algebra 560, 67--88 (2020; Zbl 1448.13038) Full Text: DOI arXiv OpenURL
Li, Shuchao; Sun, Wanting On the zero forcing number of a graph involving some classical parameters. (English) Zbl 1434.05113 J. Comb. Optim. 39, No. 2, 365-384 (2020). MSC: 05C69 05C12 05C35 05C15 PDF BibTeX XML Cite \textit{S. Li} and \textit{W. Sun}, J. Comb. Optim. 39, No. 2, 365--384 (2020; Zbl 1434.05113) Full Text: DOI OpenURL
Szabó, Sándor Metric space method for constructing splitting partitions of graphs. (English) Zbl 1439.05193 Acta Univ. Sapientiae, Inform. 11, No. 2, 131-141 (2019). MSC: 05C70 05C15 05B45 52C22 PDF BibTeX XML Cite \textit{S. Szabó}, Acta Univ. Sapientiae, Inform. 11, No. 2, 131--141 (2019; Zbl 1439.05193) Full Text: DOI OpenURL
Dong, Guanghua; Ren, Han; Huang, Yuanqiu; Wang, Ning Maximum genus and independent set. (English) Zbl 1449.05074 Ars Comb. 143, 39-45 (2019). MSC: 05C10 05C69 PDF BibTeX XML Cite \textit{G. Dong} et al., Ars Comb. 143, 39--45 (2019; Zbl 1449.05074) OpenURL
Ergemlidze, Beka; Gyori, Ervin; Methuku, Abhishek On the rainbow Turán number of paths. (English) Zbl 1406.05045 Electron. J. Comb. 26, No. 1, Research Paper P1.17, 12 p. (2019). MSC: 05C30 05C35 05C69 05C15 PDF BibTeX XML Cite \textit{B. Ergemlidze} et al., Electron. J. Comb. 26, No. 1, Research Paper P1.17, 12 p. (2019; Zbl 1406.05045) Full Text: arXiv Link OpenURL
DeVilbiss, Matthew; Johnson, Peter; Matzke, Ryan Edge Grundy numbers of the regular Turán graphs. (English) Zbl 1440.05084 Bull. Inst. Comb. Appl. 84, 45-52 (2018). MSC: 05C15 68R10 05C70 PDF BibTeX XML Cite \textit{M. DeVilbiss} et al., Bull. Inst. Comb. Appl. 84, 45--52 (2018; Zbl 1440.05084) OpenURL
Adefokun, Tayo Charles; Ajayi, Deborah Olayide On maximum induced matching numbers of special grids. (English) Zbl 1420.05139 J. Math. Appl. 41, 5-18 (2018). MSC: 05C70 05C15 PDF BibTeX XML Cite \textit{T. C. Adefokun} and \textit{D. O. Ajayi}, J. Math. Appl. 41, 5--18 (2018; Zbl 1420.05139) Full Text: DOI arXiv OpenURL
Chen, Xiaodan; Das, Kinkar Ch. Solution to a conjecture on the maximum ABC index of graphs with given chromatic number. (English) Zbl 1401.05163 Discrete Appl. Math. 251, 126-134 (2018). MSC: 05C40 05C69 05C15 PDF BibTeX XML Cite \textit{X. Chen} and \textit{K. Ch. Das}, Discrete Appl. Math. 251, 126--134 (2018; Zbl 1401.05163) Full Text: DOI OpenURL
Huang, Li-Ping Generalized bilinear forms graphs and MRD codes over a residue class ring. (English) Zbl 1385.05061 Finite Fields Appl. 51, 306-324 (2018). MSC: 05C69 05C15 05C30 15B33 94B60 PDF BibTeX XML Cite \textit{L.-P. Huang}, Finite Fields Appl. 51, 306--324 (2018; Zbl 1385.05061) Full Text: DOI OpenURL
Ajayi, Deborah Olayide; Adefokun, Tayo Charles Some bounds on the maximum induced matching numbers of certain grids. (English) Zbl 1414.05236 Acta Univ. M. Belii, Ser. Math. 25, 63-71 (2017). MSC: 05C70 05C15 PDF BibTeX XML Cite \textit{D. O. Ajayi} and \textit{T. C. Adefokun}, Acta Univ. M. Belii, Ser. Math. 25, 63--71 (2017; Zbl 1414.05236) Full Text: arXiv Link OpenURL
Jin, Yujia; Li, Huan; Zhang, Zhongzhi Maximum matchings and minimum dominating sets in Apollonian networks and extended tower of Hanoi graphs. (English) Zbl 1380.05182 Theor. Comput. Sci. 703, 37-54 (2017). MSC: 05C82 05C70 05C69 05C35 PDF BibTeX XML Cite \textit{Y. Jin} et al., Theor. Comput. Sci. 703, 37--54 (2017; Zbl 1380.05182) Full Text: DOI arXiv OpenURL
Sarkar, Ushnish; Adhikari, Avishek A new graph parameter and a construction of larger graph without increasing radio \(k\)-chromatic number. (English) Zbl 1377.05070 J. Comb. Optim. 33, No. 4, 1365-1377 (2017). MSC: 05C15 05C78 05C69 05C38 PDF BibTeX XML Cite \textit{U. Sarkar} and \textit{A. Adhikari}, J. Comb. Optim. 33, No. 4, 1365--1377 (2017; Zbl 1377.05070) Full Text: DOI OpenURL
Abu-Khzam, Faisal N.; Heggernes, Pinar Enumerating minimal dominating sets in chordal graphs. (English) Zbl 1371.05127 Inf. Process. Lett. 116, No. 12, 739-743 (2016). MSC: 05C30 05C69 05C85 PDF BibTeX XML Cite \textit{F. N. Abu-Khzam} and \textit{P. Heggernes}, Inf. Process. Lett. 116, No. 12, 739--743 (2016; Zbl 1371.05127) Full Text: DOI OpenURL
Bock, Adrian; Faenza, Yuri; Moldenhauer, Carsten; Ruiz-Vargas, Andres Jacinto Solving the stable set problem in terms of the odd cycle packing number. (English) Zbl 1360.68496 Raman, Venkatesh (ed.) et al., 34th international conference on foundation of software technology and theoretical computer science, FSTTCS 2014, New Delhi, India, December 15–17, 2014. Wadern: Schloss Dagstuhl – Leibniz Zentrum für Informatik (ISBN 978-3-939897-77-4). LIPIcs – Leibniz International Proceedings in Informatics 29, 187-198 (2014). MSC: 68Q25 05C50 05C70 68W25 PDF BibTeX XML Cite \textit{A. Bock} et al., LIPIcs -- Leibniz Int. Proc. Inform. 29, 187--198 (2014; Zbl 1360.68496) Full Text: DOI OpenURL
Walczak, Bartosz Triangle-free geometric intersection graphs with no large independent sets. (English) Zbl 1307.05180 Discrete Comput. Geom. 53, No. 1, 221-225 (2015). MSC: 05C69 05C35 05C15 05C10 PDF BibTeX XML Cite \textit{B. Walczak}, Discrete Comput. Geom. 53, No. 1, 221--225 (2014; Zbl 1307.05180) Full Text: DOI arXiv OpenURL
Alon, Noga; Balogh, József; Morris, Robert; Samotij, Wojciech Counting sum-free sets in abelian groups. (English) Zbl 1332.11030 Isr. J. Math. 199, Part A, 309-344 (2014). Reviewer: Grigore Călugăreanu (Cluj-Napoca) MSC: 11B75 11B13 20K01 05D10 PDF BibTeX XML Cite \textit{N. Alon} et al., Isr. J. Math. 199, Part A, 309--344 (2014; Zbl 1332.11030) Full Text: DOI arXiv OpenURL
Mubayi, Dhruv; Rödl, Vojtech Specified intersections. (English) Zbl 1276.05124 Trans. Am. Math. Soc. 366, No. 1, 491-504 (2014). MSC: 05D05 PDF BibTeX XML Cite \textit{D. Mubayi} and \textit{V. Rödl}, Trans. Am. Math. Soc. 366, No. 1, 491--504 (2014; Zbl 1276.05124) Full Text: DOI arXiv OpenURL
Kanj, Iyad; Zhang, Fenghui On the independence number of graphs with maximum degree 3. (English) Zbl 1266.05111 Theor. Comput. Sci. 478, 51-75 (2013). MSC: 05C69 05C85 68Q17 PDF BibTeX XML Cite \textit{I. Kanj} and \textit{F. Zhang}, Theor. Comput. Sci. 478, 51--75 (2013; Zbl 1266.05111) Full Text: DOI OpenURL
Levit, Vadim E.; Mandrescu, Eugen The cyclomatic number of a graph and its independence polynomial at \(- 1\). (English) Zbl 1266.05071 Graphs Comb. 29, No. 2, 259-273 (2013). MSC: 05C31 05C69 PDF BibTeX XML Cite \textit{V. E. Levit} and \textit{E. Mandrescu}, Graphs Comb. 29, No. 2, 259--273 (2013; Zbl 1266.05071) Full Text: DOI arXiv OpenURL
Wang, Dingguo; Shan, Erfang The signed maximum-clique transversal number of regular graphs. (English) Zbl 1257.05109 Int. J. Comput. Math. 89, No. 6, 741-751 (2012). MSC: 05C65 05C69 05C75 05C35 05D15 PDF BibTeX XML Cite \textit{D. Wang} and \textit{E. Shan}, Int. J. Comput. Math. 89, No. 6, 741--751 (2012; Zbl 1257.05109) Full Text: DOI OpenURL
Chellali, Mustapha; Rad, Nader Jafari On \(k\)-independence critical graphs. (English) Zbl 1256.05162 Australas. J. Comb. 53, 289-298 (2012). MSC: 05C69 PDF BibTeX XML Cite \textit{M. Chellali} and \textit{N. J. Rad}, Australas. J. Comb. 53, 289--298 (2012; Zbl 1256.05162) Full Text: Link OpenURL
Mkrtchyan, Vahan V.; Steffen, Eckhard Maximum \(\Delta \)-edge-colorable subgraphs of class II graphs. (English) Zbl 1247.05084 J. Graph Theory 70, No. 4, 473-482 (2012). MSC: 05C15 05C35 05C70 PDF BibTeX XML Cite \textit{V. V. Mkrtchyan} and \textit{E. Steffen}, J. Graph Theory 70, No. 4, 473--482 (2012; Zbl 1247.05084) Full Text: DOI arXiv OpenURL
Meyer, Seth A. Zero forcing sets and bipartite circulants. (English) Zbl 1236.05163 Linear Algebra Appl. 436, No. 4, 888-900 (2012). MSC: 05C70 05B20 PDF BibTeX XML Cite \textit{S. A. Meyer}, Linear Algebra Appl. 436, No. 4, 888--900 (2012; Zbl 1236.05163) Full Text: DOI arXiv OpenURL
Lv, Shengxiang; Liu, Yanpei Up-embeddability and independent number of simple graphs. (English) Zbl 1265.05158 Ars Comb. 102, 237-243 (2011). MSC: 05C10 05C35 05C69 PDF BibTeX XML Cite \textit{S. Lv} and \textit{Y. Liu}, Ars Comb. 102, 237--243 (2011; Zbl 1265.05158) OpenURL
Arul Singh, J. John; Kala, R. A note on dom-color number of a graph. (English) Zbl 1256.05064 Indian J. Math. 53, No. 3, 511-523 (2011). MSC: 05C15 05C69 PDF BibTeX XML Cite \textit{J. J. Arul Singh} and \textit{R. Kala}, Indian J. Math. 53, No. 3, 511--523 (2011; Zbl 1256.05064) OpenURL
Dujmović, Vida; Fijavž, Gašper; Joret, Gwenaël; Sulanke, Thom; Wood, David R. On the maximum number of cliques in a graph embedded in a surface. (English) Zbl 1229.05139 Eur. J. Comb. 32, No. 8, 1244-1252 (2011). MSC: 05C35 05C69 PDF BibTeX XML Cite \textit{V. Dujmović} et al., Eur. J. Comb. 32, No. 8, 1244--1252 (2011; Zbl 1229.05139) Full Text: DOI arXiv OpenURL
Lozin, Vadim V. Stability preserving transformations of graphs. (English) Zbl 1250.05083 Ann. Oper. Res. 188, 331-341 (2011). MSC: 05C69 05C85 PDF BibTeX XML Cite \textit{V. V. Lozin}, Ann. Oper. Res. 188, 331--341 (2011; Zbl 1250.05083) Full Text: DOI Link OpenURL
Du, Zhibin; Zhou, Bo The Estrada index of trees. (English) Zbl 1222.05022 Linear Algebra Appl. 435, No. 10, 2462-2467 (2011). MSC: 05C05 05C50 05C35 05C70 05C90 PDF BibTeX XML Cite \textit{Z. Du} and \textit{B. Zhou}, Linear Algebra Appl. 435, No. 10, 2462--2467 (2011; Zbl 1222.05022) Full Text: DOI OpenURL
Ouyang, Zhangdong; Huang, Yuanqiu; Zhang, Qiming Upper embeddable graphs with respect to \(A\)-partition on vertices. (Chinese. English summary) Zbl 1224.05121 Appl. Math., Ser. A (Chin. Ed.) 25, No. 1, 85-92 (2010). MSC: 05C10 05C70 PDF BibTeX XML Cite \textit{Z. Ouyang} et al., Appl. Math., Ser. A (Chin. Ed.) 25, No. 1, 85--92 (2010; Zbl 1224.05121) OpenURL
Montassier, Mickael; Pêcher, Arnaud; Raspaud, André; West, Douglas B.; Zhu, Xuding Decomposition of sparse graphs, with application to game coloring number. (English) Zbl 1219.05145 Discrete Math. 310, No. 10-11, 1520-1523 (2010). MSC: 05C70 05C15 91A43 PDF BibTeX XML Cite \textit{M. Montassier} et al., Discrete Math. 310, No. 10--11, 1520--1523 (2010; Zbl 1219.05145) Full Text: DOI Link OpenURL
Alishahi, Meysam; Hajiabolhassan, Hossein; Taherkhani, Ali A generalization of the Erdős-Ko-Rado theorem. (English) Zbl 1181.05033 Discrete Math. 310, No. 1, 188-191 (2010). MSC: 05C15 05C69 05C35 PDF BibTeX XML Cite \textit{M. Alishahi} et al., Discrete Math. 310, No. 1, 188--191 (2010; Zbl 1181.05033) Full Text: DOI arXiv OpenURL
Kang, Ross; Manggala, Putra On distance edge-colourings and matchings. (English) Zbl 1273.05071 Nešetřil, Jaroslav (ed.) et al., Extended abstracts of the 5th European conference on combinatorics, graph theory and applications, EuroComb’09, Bordeaux, France, September 7–11, 2009. Amsterdam: Elsevier. Electronic Notes in Discrete Mathematics 34, 301-306 (2009). MSC: 05C15 05C70 05C80 PDF BibTeX XML Cite \textit{R. Kang} and \textit{P. Manggala}, Electron. Notes Discrete Math. 34, 301--306 (2009; Zbl 1273.05071) Full Text: DOI OpenURL
Xu, Kexiang; Xu, Baogang Some extremal unicyclic graphs with respect to Hosoya index and Merrifield-Simmons index. (English) Zbl 1274.05395 MATCH Commun. Math. Comput. Chem. 62, No. 3, 629-648 (2009). MSC: 05C70 05C69 05C35 PDF BibTeX XML Cite \textit{K. Xu} and \textit{B. Xu}, MATCH Commun. Math. Comput. Chem. 62, No. 3, 629--648 (2009; Zbl 1274.05395) OpenURL
Palubeckis, G. On the recursive largest first algorithm for graph colouring. (English) Zbl 1139.05024 Int. J. Comput. Math. 85, No. 2, 191-200 (2008). Reviewer: Václav Koubek (Praha) MSC: 05C15 05C69 05C85 68R10 68W25 90C27 PDF BibTeX XML Cite \textit{G. Palubeckis}, Int. J. Comput. Math. 85, No. 2, 191--200 (2008; Zbl 1139.05024) Full Text: DOI OpenURL
Chen, Yichao; Liu, Yanpei Maximum genus, girth and maximum non-adjacent edge set. (English) Zbl 1141.05316 Ars Comb. 79, 145-159 (2006). Reviewer: Tomáš Kaiser (Plzeň) MSC: 05C10 05C35 05C70 PDF BibTeX XML Cite \textit{Y. Chen} and \textit{Y. Liu}, Ars Comb. 79, 145--159 (2006; Zbl 1141.05316) OpenURL
Dutton, Ronald D.; Brigham, Robert C. Partitioning of trees having maximum degree at most three. (English) Zbl 1048.05026 J. Comb. Math. Comb. Comput. 45, 79-93 (2003). Reviewer: Tomáš Dvořák (Praha) MSC: 05C05 05C70 PDF BibTeX XML Cite \textit{R. D. Dutton} and \textit{R. C. Brigham}, J. Comb. Math. Comb. Comput. 45, 79--93 (2003; Zbl 1048.05026) OpenURL
Brewster, Richard C.; MacGillivray, Gary Minimizing \(\beta+\Delta\) and well covered graphs. (English) Zbl 1071.05054 Ars Comb. 61, 197-210 (2001). Reviewer: Bohdan Zelinka (Liberec) MSC: 05C69 PDF BibTeX XML Cite \textit{R. C. Brewster} and \textit{G. MacGillivray}, Ars Comb. 61, 197--210 (2001; Zbl 1071.05054) OpenURL
Levit, Vadim E.; Mandrescu, Eugen On \(\alpha^{++}\)-stable graphs. (English) Zbl 0976.05049 Congr. Numerantium 142, 207-219 (2000). MSC: 05C70 05C75 PDF BibTeX XML Cite \textit{V. E. Levit} and \textit{E. Mandrescu}, Congr. Numerantium 142, 207--219 (2000; Zbl 0976.05049) Full Text: arXiv OpenURL
Stanton, R. G. A study of hendecads. (English) Zbl 0831.05019 Australas. J. Comb. 11, 239-246 (1995). Reviewer: P.Braß (Greifswald) MSC: 05B40 05B05 PDF BibTeX XML Cite \textit{R. G. Stanton}, Australas. J. Comb. 11, 239--246 (1995; Zbl 0831.05019) OpenURL
Sun, Liang Total coloring of composition graphs. (Chinese. English summary) Zbl 0816.05029 J. Beijing Inst. Technol. 13, No. 2, Part II, 213-216 (1993). MSC: 05C15 05C70 PDF BibTeX XML Cite \textit{L. Sun}, J. Beijing Inst. Technol. 13, No. 2, Part II, 213--216 (1993; Zbl 0816.05029) OpenURL
Caro, Y.; Roditty, Y. On decomposition of graphs into nonisomorphic independent sets. (English) Zbl 0782.05063 Ars Comb. 35, 97-102 (1993). Reviewer: M.Truszczyński (Lexington) MSC: 05C70 05C15 PDF BibTeX XML Cite \textit{Y. Caro} and \textit{Y. Roditty}, Ars Comb. 35, 97--102 (1993; Zbl 0782.05063) OpenURL
Alon, N.; Freiman, G. On sums of subsets of a set of integers. (English) Zbl 0666.10035 Combinatorica 8, No. 4, 297-306 (1988). Reviewer: M. M. Dodson (Heslington) MSC: 11B13 11P55 11B75 05A05 PDF BibTeX XML Cite \textit{N. Alon} and \textit{G. Freiman}, Combinatorica 8, No. 4, 297--306 (1988; Zbl 0666.10035) Full Text: DOI OpenURL
Frankl, P.; Füredi, Z.; Pach, J. Bounding one-way differences. (English) Zbl 0663.05003 Graphs Comb. 3, 341-347 (1987). MSC: 05A05 05B10 PDF BibTeX XML Cite \textit{P. Frankl} et al., Graphs Comb. 3, 341--347 (1987; Zbl 0663.05003) Full Text: DOI OpenURL
Molitor, Paul On the contact-minimization-problem. (English) Zbl 0635.94027 STACS 87, Theoretical aspects of computer science, Proc. 4th annu. Symp., Passau/FRG 1987, Lect. Notes Comput. Sci. 247, 420-431 (1987). MSC: 94C15 68Q25 05C70 PDF BibTeX XML OpenURL
Zelinka, Bohdan Connected domatic number of a graph. (English) Zbl 0625.05042 Math. Slovaca 36, 387-392 (1986). Reviewer: G.Chartrand MSC: 05C99 PDF BibTeX XML Cite \textit{B. Zelinka}, Math. Slovaca 36, 387--392 (1986; Zbl 0625.05042) Full Text: EuDML OpenURL
Ferrari, L.; Sankar, P. V.; Sklansky, J. Minimal rectangular partitions of digitized blobs. (English) Zbl 0599.68051 Comput. Vision Graphics Image Process. 28, 58-71 (1984). MSC: 68R10 05C70 PDF BibTeX XML Cite \textit{L. Ferrari} et al., Comput. Vis. Graph. Image Process. 28, 58--71 (1984; Zbl 0599.68051) Full Text: DOI OpenURL
Nabeya, Seiji On the maximum number of balancing subsets. (English) Zbl 0553.05001 J. Math. Econ. 13, 123-126 (1984). MSC: 05A05 PDF BibTeX XML Cite \textit{S. Nabeya}, J. Math. Econ. 13, 123--126 (1984; Zbl 0553.05001) Full Text: DOI OpenURL
Frankl, Peter; Füredi, Zoltan Union-free hypergraphs and probability theory. (English) Zbl 0546.05049 Eur. J. Comb. 5, 127-131 (1984). Reviewer: D.Kleitman MSC: 05C65 05A05 60C05 PDF BibTeX XML Cite \textit{P. Frankl} and \textit{Z. Füredi}, Eur. J. Comb. 5, 127--131 (1984; Zbl 0546.05049) Full Text: DOI OpenURL
Akiyama, Jin; Harary, Frank The regulation number of a graph. (English) Zbl 0557.05058 Publ. Inst. Math., Nouv. Sér. 34(48), 3-5 (1983). Reviewer: K.R.Parthasarathy MSC: 05C70 05C75 05C99 PDF BibTeX XML Cite \textit{J. Akiyama} and \textit{F. Harary}, Publ. Inst. Math., Nouv. Sér. 34(48), 3--5 (1983; Zbl 0557.05058) Full Text: EuDML OpenURL
Tarakanov, V. E. On the depth of (0,1)-matrices with equal row and equal column sums. (Russian) Zbl 0527.05016 Mat. Zametki 34, No. 3, 463-476 (1983). MSC: 05B20 05C70 PDF BibTeX XML Cite \textit{V. E. Tarakanov}, Mat. Zametki 34, No. 3, 463--476 (1983; Zbl 0527.05016) OpenURL
Daykin, David E.; Frankl, Peter On Kruskal’s cascades and counting containments in a set of subsets. (English) Zbl 0527.05002 Mathematika 30, 133-141 (1983). MSC: 05A05 05A15 PDF BibTeX XML Cite \textit{D. E. Daykin} and \textit{P. Frankl}, Mathematika 30, 133--141 (1983; Zbl 0527.05002) Full Text: DOI OpenURL
Gusfield, Dan Connectivity and edge-disjoint spanning trees. (English) Zbl 0507.05030 Inf. Process. Lett. 16, 87-89 (1983). MSC: 05C05 05C40 05C70 PDF BibTeX XML Cite \textit{D. Gusfield}, Inf. Process. Lett. 16, 87--89 (1983; Zbl 0507.05030) Full Text: DOI OpenURL
Berge, Claude Diperfect graphs. (English) Zbl 0511.05035 Combinatorica 2, 213-222 (1982). MSC: 05C20 05C15 05C70 PDF BibTeX XML Cite \textit{C. Berge}, Combinatorica 2, 213--222 (1982; Zbl 0511.05035) Full Text: DOI OpenURL
Tucker, Alan C. Berge’s strong perfect graph conjecture. (English) Zbl 0486.05054 Combinatorial mathematics, 2nd int. Conf., New York 1978, Ann. New York Acad. Sci. 319, 530-535 (1979). MSC: 05C70 05C15 PDF BibTeX XML OpenURL