@book{28025,
	author = {Balser, Werner, and ebrary, Inc.},
	title = {Formal power series and linear systems of meromorphic ordinary differential equations},
	publisher = {Springer,},
	year = {2000.},
	series = {Universitext},
	address = {New York :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10015673}
}