Geodesic
Approximate methods for calculating the period of oscillations for the generalized Lienard's differential equation
Portugaliae mathematica, Tome 41 (1982) no. 1-4, pp. 71-81.

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Keywords: Van der Pol method, Liénard’s differential equation, period of oscillations, numerical results 
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     author = {Eid, M.H. and Anwar, M.N. and El-Serafi, S.A.},
     title = {Approximate methods for calculating the period of oscillations for the generalized {Lienard's} differential equation},
     journal = {Portugaliae mathematica},
     pages = {71--81},
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     number = {1-4},
     year = {1982},
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     zbl = {0564.34038},
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     url = {http://geodesic.mathdoc.fr/item/PORMA_1982__41_1-4_115484/}
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Eid, M.H.; Anwar, M.N.; El-Serafi, S.A. Approximate methods for calculating the period of oscillations for the generalized Lienard's differential equation. Portugaliae mathematica, Tome 41 (1982) no. 1-4, pp. 71-81. http://geodesic.mathdoc.fr/item/PORMA_1982__41_1-4_115484/