@book{2957,
	author = {Kolář, Ivan, and Michor, Peter W.,},
	title = {Natural operations in differential geometry /},
	publisher = {Springer-Verlag,},
	year = {c1993.},
	address = {Berlin ;},
	url = {http://www.loc.gov/catdir/enhancements/fy0815/92045829-d.html}
}