@book{13682,
	author = {Zakrzewski, W. J.},
	title = {Low-dimensional sigma models /},
	publisher = {A. Hilger,},
	year = {c1989.},
	address = {Bristol, England ;},
	url = {http://www.loc.gov/catdir/enhancements/fy0745/88034764-d.html}
}