TY - JOUR AU - Krejčí, Pavel TI - Periodic solutions of a class of abstract nonlinear equations of the second order JO - Časopis pro pěstování matematiky PY - 1985 SP - 122 EP - 129 VL - 110 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.21136/CPM.1985.108593/ DO - 10.21136/CPM.1985.108593 LA - en ID - 10_21136_CPM_1985_108593 ER -