TY - JOUR AU - Hamedani, G. G. TI - On the existence of periodic boundary conditions for certain nonlinear vector differential equations JO - Časopis pro pěstování matematiky PY - 1979 SP - 248 EP - 254 VL - 104 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.21136/CPM.1979.118020/ DO - 10.21136/CPM.1979.118020 LA - en ID - 10_21136_CPM_1979_118020 ER -