@book{63021,
	author = {Kreyszig, Erwin},
	title = {Advanced engineering mathematics /},
	publisher = {Wiley,},
	year = {1993},
	address = {New York, NY :},
	edition = {7th ed.},
	url = {http://www.loc.gov/catdir/toc/onix05/92006989.html}
}