@book{11144,
	author = {Courant, R.},
	title = {Calculus of variations, 1945-46 with supplementary notes and exercises by Martin Kruskal and Hanan Rubin},
	publisher = {Courant Instt. of Mathematical Sciences,},
	year = {n.d.},
	series = {Courant Institute lecture notes},
	address = {New York:}
}