@book{36379,
	author = {Vassiliou, Efstathios. and Hazewinkel, M. and SpringerLink (Online service)},
	title = {Geometry of Principal Sheaves},
	publisher = {Springer Netherlands,},
	year = {2005.},
	series = {Mathematics and Its Applications ;},
	address = {Dordrecht :},
	url = {http://dx.doi.org/10.1007/1-4020-3416-4}
}