Butenin, N. V. <br/><br/>
Elements of the theory of nonlinear oscillations 
N. V. Butenin                                                 
 - New York  Blaisdell Publishing  1965 
 - viii, 226p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential Equations<br/>NASA Thesaurus<br/>Nonlinear Equations
<br/><br/><label>Universal Decimal Class. No.: </label>517.928.4  / BUT