1. On generalized ramsey numbers for trees

   • Jürgen Bierbrauer
   • Albrecht Brandis

   OriginalPaper Pages: 95 - 107

2. A new upper bound for the length of snakes

   • Knut Deimer

   OriginalPaper Pages: 109 - 120

3. The chromatic number of the product of two 4-chromatic graphs is 4

   • Mohamed El-Zahar
   • Norbert Sauer

   OriginalPaper Pages: 121 - 126

4. A characterization of planar graphs by trémaux orders

   • H. de Fraysseix
   • P. Rosenstiehl

   OriginalPaper Pages: 127 - 135

5. The chromatic number of the product of two ℵ₁-chromatic graphs can be countable

   • A. Hajnal

   OriginalPaper Pages: 137 - 139

6. The struction of a graph: Application toCN-free graphs

   • P. L. Hammer
   • N. V. R. Mahadev
   • D. de Werra

   OriginalPaper Pages: 141 - 147

7. A generalization of dirac’s theorem

   • Stephen C. Locke

   OriginalPaper Pages: 149 - 159

8. Degree and local connectivity in digraphs

   • W. Mader

   OriginalPaper Pages: 161 - 165

9. On triangulations of the convex hull ofn points

   • B. L. Rotschild
   • E. G. Straus

   OriginalPaper Pages: 167 - 179