%0 Journal Article
%A W. M. Mikulski
%T On the Helmholtz operator of variational calculus
 in fibered-fibered manifolds
%J Annales Polonici Mathematici
%D 2007
%P 59-76
%V 90
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/ap90-1-5/
%R 10.4064/ap90-1-5
%G en
%F 10_4064_ap90_1_5