DISCRETE MATHEMATICS VOLUME 126, NUMBERS 1-3, 1 MARCH 1994 CONTENTS A.M. Assaf and L.P.S. Singh Packing pairs by quintuples with index 2: v odd, v# 13 (mod 20) 1 A.E. Brouwer On the uniqueness of a regular thin near octagon on 288 vertices (or the semibiplane belonging to the Mathieu group ™,2 ) 13 N.P. Carnes Cyclic antiautomorphisms of Mendelsohn triple systems 29 V.-E. Cazanescu and G. Stefanescu Classes of finite relations as initial abstract data types — II 47 N. Dean and J. Zito Well-covered graphs and extendability 67 F.M. Dekking Iteration of maps by an automaton 81 J.K. Dugdale and A.J.W. Hilton The total chromatic number of regular graphs whose complement is bipartite 87 A. Dir On the covering radius of Reed-Solomon codes 99 P.H. Edelman and R. Simion Chains in the lattice of noncrossing partitions 107 R.J. Faudree, R.H. Schelp, L. Lesniak, A. Gyarfas and J. Lehel On the rotation distance of graphs 121 A.S. Fraenkel and C. Kimberling Generalized Wythoff arrays, shuffles and interspersions 137 M. Frick and M.A. Henning Extremal results on defective colorings of graphs 151 A.V. lvashchenko Contractible transformations do not change the homology groups of graphs 159 A.V. lvashchenko and Y.-N. Yeh Minimal graphs of a torus, a projective plane and spheres and some properties of minimal graphs of homotopy classes 171 C. Knessl Asymptotic behavior of high-order differences of the plane partition function 179 C. Krattenthaler and S.G. Mohanty q-Generalization of a ballot problem 195 A. Lascoux and P. Pragacz Divided differences and ideals generated by symmetric polynomials 209 E. London A new proof of the colored Kruskal—Katona theorem Q. Mushtaq and F. Shaheen Factor groups of G*® ® ® through coset diagrams for an action on PL(F,) M.M. Petrovic, |. Gutman and M. Lepovié Graphs with small numbers of independent edges 239 T. Politof and A. Satyanarayana Minors of quasi 4-connected graphs 245 V. Rice and R.D. Ringeisen On cohesion stable graphs 257 R.B. Richter, P.D. Seymour and J. Sirah Circular embeddings of planar graphs in nonspherical surfaces 273 A. Riskin Projective plane embeddings of polyhedral pinched maps 281 B.E. Sagan, Y.-N. Yeh and G.M. Ziegler Maximizing Mébius functions on subsets of Boolean algebras 293 P. Sankaran and K. Varadarajan A note on the homotopy type of posets 313 Y. Shi On simple MCD graphs containing a subgraph homeomorphic to K, 325 H.J. Shyr, S.S. Yu and G. Thierrin Monogenic e-closed languages and dipolar words 339 LA. Stewart Deciding whether a planar graph has a cubic subgraph is NP-complete 349 H. Wang On K,_,-factorizations of a complete bipartite graph 359 G. Zemor A generalisation to noncommutative groups of a theorem of Mann 365 Communications T. Dridi Distributions binaires unimodales 373 D. Rawlings Limit formulas for q-exponential functions 379 M. Stiebitz The forest plus stars colouring porblem 385 X. Yang and J.L. Massey The condition for a cyclic code to have a complementary dual Notes M. Erickson A conjecture concerning Ramsey's thoerem 395 D. Fronéek e-Realization of double-stars 399 J. Fulman A generalization of Vizing’s theorem on domination 403 Z. Furedi Random Ramsey graphs for the four-cycle 407 T.N. Janakiraman On special classes of self-centred graphs 411 A. lorgulescu SY -prealgebras 415 R. Labahn and |. Warnke Quick gossiping by telegraphs 421 G.L. Mayhew Weight class distributions of de Bruijn sequences 425 S.D. Sarti Remarks on umbral evaluations of chromatic polynomials 431 K. Sinha A class of g-ary codes 439 J. Zurawiecki Universal circuit matrix for adjacency graphs of feedback functions 441 Erratum To: G.A. Freiman, New analytical results in subset-sum problem 447 Author index to volume 126