@book{11369,
	author = {Lusternik, L. A. and Sobolev, V. J. and Sobolev, V. J. ; jt. auth.},
	title = {Elements of functional analysis},
	publisher = {Hindustan},
	year = {1961},
	series = {Russian monographs and texts on Advanced Mathematics and Physics},
	address = {Delhi}
}