TY - JOUR AU - Călin Şerban TI - Multiple solutions of Neumann systems of relativistic type JO - Minimax theory and its applications PY - 2018 VL - 3 IS - 1 UR - http://geodesic.mathdoc.fr/item/MTA_2018_3_1_a8/ ID - MTA_2018_3_1_a8 ER -