@book{11810,
	author = {Andronov, A. A. and Khaĭkin, S. Ė.},
	title = {Theory of oscillations /},
	publisher = {Princeton Univ. Press,},
	year = {1949.},
	address = {Princeton :},
	edition = {English language ed.,},
	note = {A condensation of the author's Teorii͡a︡ kolebaniĭ (romanized form) v.1. pub. in 1937, made as part of the work on the project on non-linear differential equations under contract with the Office Naval Research, Prject NR 043-942.}
}