%0 Journal Article
%A Long, Yiming
%T The minimal period problem of classical hamiltonian systems with even potentials
%J Annales de l'I.H.P. Analyse non linéaire
%D 1993
%P 605-626
%V 10
%N 6
%I Gauthier-Villars
%U http://www.numdam.org/item/AIHPC_1993__10_6_605_0/
%G en
%F AIHPC_1993__10_6_605_0