%0 Journal Article %A R. Gatignol %A N. Sibgatullin %T Canonical variables and the Hamilton principle for a stratified heavy fluid %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 1993 %P 72-76 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMUMM_1993_3_a12/ %G ru %F VMUMM_1993_3_a12