Combinatorial mathematics VII proceedings of the Seventh Australian Conference on Combinatorial Mathematics held at the University of Newcastle, Australia, August 20-24, 1979 / edited by R.W. Robinson, G.W. Southern, and W.D. Wallis. - Robinson, R. W. (Robert William), 1941-; Southern, G. W. (George William), 1933-; Wallis, W. D. (Lecture notes in mathematics (Springer-Verlag) ;, 1980)