@book{213175,
	author = {Naza�ikinski�i, V. E. and Shatalov, V. E. and ebrary, Inc.},
	title = {Contact geometry and linear differential equations},
	publisher = {W. de Gruyter,},
	year = {1992.},
	series = {De Gruyter expositions in mathematics,},
	address = {Berlin ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10597967}
}