%0 Journal Article %A Hamedani, G. G. %T On the existence of periodic boundary conditions for certain nonlinear vector differential equations %J Časopis pro pěstování matematiky %D 1979 %P 248-254 %V 104 %N 3 %U http://geodesic.mathdoc.fr/articles/10.21136/CPM.1979.118020/ %R 10.21136/CPM.1979.118020 %G en %F 10_21136_CPM_1979_118020