@book{21656,
	author = {Mittal, S. C. and Agarwal, D. C.},
	title = {Differential geometry of three dimensions /},
	publisher = {Krishna prakashan mandir,},
	year = {1970.},
	series = {Book for B.A. honours and post-graduate mathematics students, 3},
	address = {Meerut, India :},
	edition = {5th ed.}
}