@book{8882,
	author = {Colloquium on Infinite and Finite sets, Keszthely, Hungary June 25-July 1, 1973 and Rado, Hajnal R. ; ed.},
	title = {Infintte and finite sets; colloquium papers in honour of prof. Paul Erdos for his 60th birthday},
	publisher = {North-Holland},
	year = {1975},
	address = {Amsterdam}
}