TY - BOOK T1 - Contributions to the theory of nonlinear oscillations. T2 - Annals of mathematics studies. A1 - Lefschetz, Solomon LA - English PP - Princeton PB - Princeton University Press YR - 1952 UL - http://vufind10-pruebas.sigbunlp.bibliotecas.unlp.edu.ar/Record/dfi.9927 OP - 116 KW - VIBRACIONES KW - ACUSTICA KW - VIBRACIONES MECANICAS ER -