@book{7069,
	author = {Szőkefalvi-Nagy, Béla, and Colloquium on Qualitative Theory of Differential Equations},
	title = {Differential equations :},
	publisher = {North-Holland,},
	year = {c1987.},
	series = {Colloquia mathematica Societatis János Bolyai,},
	address = {Amsterdam :},
	note = {Papers from the second Colloquium on Qualitative Theory of Differential Equations, held in Szeged, Hungary, Aug. 27-31, 1984.}
}