@book{35540,
	author = {Toponogov, Victor A. and Rovenski, Vladimir Y. and SpringerLink (Online service)},
	title = {Differential Geometry of Curves and Surfaces},
	publisher = {Birkhäuser Boston,},
	year = {2006.},
	address = {Boston, MA :},
	url = {http://dx.doi.org/10.1007/b137116}
}