@book{14614,
	author = {Bernstein, Dorothy Lewis,},
	title = {Existence theorems in partial differential equations /},
	publisher = {Princeton University Press,},
	year = {1950[Reprinting 1951].},
	address = {Princeton :},
	note = {"Prepared for the Office of Naval Research by Engineering Research Associates, inc., under contract N6onr-240."}
}