%0 Journal Article %A Andres, Jan %T Periodic boundary value problem for certain nonlinear differential equations of the third order %J Mathematica slovaca %D 1985 %P 305-309 %V 35 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1985__35_3_a12/ %G en %F MASLO_1985__35_3_a12