%0 Journal Article
%A O. Krupková
%A G. E. Prince
%T Lepage forms, closed 2-forms and second-order ordinary differential equations
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 2007
%P 3-18
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_2007_12_a0/
%G ru
%F IVM_2007_12_a0