@book{25612,
	author = {Indian Statistical Institute, Calcutta and Berge, C.},
	title = {Six papers on graph theory},
	publisher = {Indian Statistical Institute,},
	year = {1963},
	address = {Calcutta:},
	note = {"Prof C. Berge delivered a series of lectures at Research & Training School, I. S. I., Calcutta"}
}