TY - JOUR AU - Horová, Ivana TI - On the variational principles for partial differential equations JO - Archivum mathematicum PY - 1988 SP - 17 EP - 23 VL - 24 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ARM_1988__24_1_a2/ LA - en ID - ARM_1988__24_1_a2 ER -