@book{9006,
	author = {British Combinatorial Conference Univ. College of Wales, Aberystwyth, 2-6 July, 1973 and McDonough, T. P. ; ed.},
	title = {Combinatorics; proceedings of the 4th conf. 1973.},
	publisher = {Cambridge University Press},
	year = {1974},
	address = {Cambridge}
}