@book{7995,
	author = {Farkas, Miklós. and Bolyai János Matematikai Társulat.},
	title = {Differential equations /},
	publisher = {North-Holland,},
	year = {1977.},
	series = {Colloquia mathematica Societatis János Bolyai ; 15},
	address = {Amsterdam ;},
	note = {Papers presented at a colloquium organized by Bolyai János Mathematical Society at Keszthely, Hungary in 1974.}
}