%0 Journal Article
%A Marzantowicz, Wacław
%A Parusiński, Adam
%T Periodic solutions near an equilibrium of a differential equation with a first integral
%J Rendiconti del Seminario Matematico della Università di Padova
%D 1987
%P 193-206
%V 77
%I Seminario Matematico of the University of Padua
%U http://www.numdam.org/item/RSMUP_1987__77__193_0/
%G en
%F RSMUP_1987__77__193_0