@book{53004,
	author = {Bogoli͡ubov, N. N. and Mitropolʹskiĭ, I͡U. A.},
	title = {Asymptotic methods in the theory of non-linear oscillations},
	publisher = {Hindustan Pub. Corp., [stamped:},
	year = {1961.},
	address = {Delhi,},
	edition = {[2. ed.].},
	note = {[Russian monographs and texts on advanced mathematics and physics. v. 10]}
}