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doi:10.1016/0022-247X(89)90094-2    
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Copyright © 1989 Published by Elsevier Inc.

Periodic solutions of some Lienard and Duffing equations

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Chaitan P. Guptaa, Juan J. Nietob and Luis Sanchezc

a Department of Mathematical Sciences, Northern Illinois University, DeKalb, Illinois 60115, USA

b Departamento de Analisis Matematico, Universidad de Santiago, Santiago de Compostela, Spain

c CMAF, Avenida Professor Gama Pinto 2, 1699, Lisboa Codex, Portugal


Received 12 November 1986. 
Submitted by V. Lakshmikantham. 
Available online 29 June 2004.

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Journal of Mathematical Analysis and Applications
Volume 140, Issue 1, 15 May 1989, Pages 67-82
 
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