Lefschetz.S. <br/><br/>
Contributiona to the Theory of Nonlinear Ocillations  Textual Documents 

 - 1950. 
 - Princeton:  Princeton University Press,  1950. 
 - ix;350p.:  01059. 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Statistics,Ocillation of a Third Order Nonlinear Autonomous System, Forced Osillations in Nonlinear Systems.