Journal of Combinatorial Theory, Series B, Volume 70

Volume 70, Number 1, May 1997

• Special Issue Dedicated to W. T. Tutte. 1
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• Neil Robertson, Daniel P. Sanders, Paul D. Seymour, Robin Thomas:
  The Four-Colour Theorem. 2-44
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• László Lovász:
  The Membership Problem in Jump Systems. 45-66
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• Carsten Thomassen:
  Color-Critical Graphs on a Fixed Surface. 67-100
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• James F. Geelen:
  A Generalization of Tutte's Characterization of Totally Unimodular Matrices. 101-117
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• David B. Massey, Rodica Simion, Richard P. Stanley, Dirk L. Vertigan, Dominic J. A. Welsh, Günter M. Ziegler:
  Lê Numbers of Arrangements and Matroid Identities. 118-133
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• Maurits de Graaf, Alexander Schrijver:
  Making Curves Minimally Crossing by Reidemeister Moves. 134-156
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• Maurits de Graaf, Alexander Schrijver:
  Decomposition of Graphs on Surfaces. 157-165
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• Neil Robertson, Paul D. Seymour, Robin Thomas:
  Tutte's Edge-Colouring Conjecture. 166-183
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• Paul D. Seymour:
  Two Chromatic Polynomial Conjectures. 184-196
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• Noga Alon, Michael Tarsi:
  A Note on Graph Colorings and Graph Polynomials. 197-201
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• Talmage James Reid, Haidong Wu:
  A Longest Cycle Version of Tutte's Wheels Theorem. 202-215
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Volume 70, Number 2, July 1997

• Zdenek Ryjácek:
  On a Closure Concept in Claw-Free Graphs. 217-224
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• Gena Hahn, François Laviolette, Jozef Sirán:
  Edge-Ends in Countable Graphs. 225-244
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• Bing Zhou:
  Some Theorems Concerning the Star Chromatic Number of a Graph. 245-258
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• J. Arias de Reyna:
  Finite Fields and Ramanujan Graphs. 259-264
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• Serge Lawrencenko, Seiya Negami:
  Irreducible Triangulations of the Klein Bottle. 265-291
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• Atsuhiro Nakamoto, Katsuhiro Ota:
  Diagonal Transformations of Graphs and Dehn Twists of Surfaces. 292-300
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• Péter Komjáth:
  Two Remarks on the Coloring Number. 301-305
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• Carsten Thomassen:
  A Simpler Proof of the Excluded Minor Theorem for Higher Surfaces. 306-311
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• Stéphanie Conilh:
  Note on Kocay's 3-Hypergraphs and Stockmeyer's Tournaments. 312-316
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• André E. Kézdy, Hunter S. Snevily:
  On Extensions of a Conjecture of Gallai. 317-324
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• Thomas Zaslavsky:
  The Largest Parity Demigenus of a Simple Graph. 325-345
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• Artur Andrzejak:
  Splitting Formulas for Tutte Polynomials. 346-366
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• Jean-François Saclé, Mariusz Wozniak:
  The Erdös-Sós Conjecture for Graphs withoutC₄. 367-372
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