Bogoliubov, N.N. <br/><br/>
Asymptotic methods in the theory of non-linear oscillation /(by) N.N. Bogoliubov, Y.A. Mitropolsky, Tr. from the Russian.   
by N.N. Bogoliubov, Y.A. Mitropolsky. 
 -  Hind. Pub. Corp.  1961 
<br/><br/><label>Dewey Class. No.: </label>531.322  / N61