%0 Journal Article %A Andres, Jan %A Vlček, Vladimír %T Periodic solutions of the third order parametric differential equations involving large nonlinearities %J Mathematica slovaca %D 1991 %P 337-349 %V 41 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1991__41_4_a0/ %G en %F MASLO_1991__41_4_a0