TY  - JOUR
AU  - W. M. Mikulski
TI  - On the Helmholtz operator of variational calculus
 in fibered-fibered manifolds
JO  - Annales Polonici Mathematici
PY  - 2007
SP  - 59
EP  - 76
VL  - 90
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/ap90-1-5/
DO  - 10.4064/ap90-1-5
LA  - en
ID  - 10_4064_ap90_1_5
ER  -