Graph theory : proceedings of the Conference on Graph Theory, Cambridge / Bollobás, Béla. Graph theory 511 NOR 1982 A027 Or. Amsterdam ; New York : North-Holland Pub. Co. ; New York, N.Y. : Sole distributors for the U.S.A. and Canada, Elsevier Science Pub. Co., 1982. 1982. Text viii, 201 p. :