TY - JOUR AU - Andres, Jan AU - Vlček, Vladimír TI - Periodic solutions of the third order parametric differential equations involving large nonlinearities JO - Mathematica slovaca PY - 1991 SP - 337 EP - 349 VL - 41 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MASLO_1991__41_4_a0/ LA - en ID - MASLO_1991__41_4_a0 ER -