%0 Journal Article
%A T. F. Ivanov
%T Determination of periodic motions in conservative systems with one degree of freedom
%J Doklady Akademii Nauk
%D 1962
%P 297-300
%V 143
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1962_143_2_a13/
%G ru
%F DAN_1962_143_2_a13