Lefschetz.S. <br/><br/>
Contributions to the Theory of Nonlinear Oscillations  Textual Documents 

 - 1952. 
 - Princeton :  Princeton University Press,  1952. 
 - 116p.:  01157. 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Statistics, Dynamical Systems With Stable Structures, Notes on Differental Equations.