@book{81995,
	author = {SOFSEM and Pacholski, Leszek.},
	title = {SOFSEM 2001, theory and practice of informatics :},
	publisher = {Springer,},
	year = {2001.},
	address = {Berlin ;},
	url = {http://link.springer-ny.com/link/service/series/0558/tocs/t2234.htm}
}