@book{12804,
	author = {Milnor, J. and Spivak, M. ; notes by-},
	title = {Morse theory},
	publisher = {Princeton University Press},
	year = {1969},
	series = {Annals of Mathematics studies },
	address = {New Jersey},
	note = {"Based on lecture notes by M. Spivak and R. Wells."}
}