%0 Journal Article %A Horová, Ivana %T On the variational principles for partial differential equations %J Archivum mathematicum %D 1988 %P 17-23 %V 24 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/ARM_1988__24_1_a2/ %G en %F ARM_1988__24_1_a2