@book{18221,
	author = {Hormander, L.},
	title = {Lectures on nonlinear hyperbolic differential equations},
	publisher = {Springer-Verlag},
	year = {1997},
	series = {Mathematiques & applications},
	address = {New York},
	note = {"Revised version of notes from lectures given at the University of Lund during three semesters 1986-87"}
}