@book{7880,
	author = {Bers, Lipman, and Bergman, Stefan,},
	title = {Contributions to the theory of partial differential equations /},
	publisher = {Princeton University Press,},
	year = {1954.},
	address = {Princeton :},
	note = {"Papers ... read at the Conference on Partial Differential Equations, sponsored by the National Academy of Sciences, National Research Council, October 1952."}
}