@book{7434,
	author = {Dubrovin, B.A....[et.al.] and Fomenko, A.T.},
	title = {Modern geometry-methods and applications: the geometry of surface and transformation groups (Part I)},
	publisher = {Springer},
	year = {2010},
	address = {New Dehli},
	edition = {2nd ed.}
}