%0 Journal Article
%A Eid, M.H.
%A Anwar, M.N.
%A El-Serafi, S.A.
%T Approximate methods for calculating the period of oscillations for the generalized Lienard's differential equation
%J Portugaliae mathematica
%D 1982
%P 71-81
%V 41
%N 1-4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/PORMA_1982__41_1-4_115484/
%G en
%F PORMA_1982__41_1-4_115484