Lefschetz, Solomon.  <br/><br/>
Contributions to the theory of nonlinear oscillations. 

 - Princeton :   Priceton University Press,   1950. 
 - 350 p. 
 - Annals of Mathematics studies.   [Volume 1] .
<br/><br/> En dos volúmenes 
<br/><br/>On systems of ordinary differential equations / Diliberto. S. P. Oscillations of a third order nonlinear autonomous system / Rauch. L. L. Nonlinear Difference-Differential Equations / Brownell. F. H. Forced oscillations in nonlinear Systems / Cartwright. M. L. Singular perturbations of a Van der Pol Equation/ Wendel. J. G. The existence of forced periodic solutions of second order differential equations near certain equilibrium points of the unforced equation / Langenhop. C. E. The construction of periodic solutions of singular perturbation problems / Wasow, Wolfgang 
<br/><br/><label>Subjects--Topical Terms: </label><br/>VIBRACIONES<br/>ACUSTICA<br/>VIBRACIONES MECANICAS<br/>OSCILACIONES
<br/><br/><label>Universal Decimal Class. No.: </label>531.14