TY - JOUR AU - V. Pták TI - On the closed graph theorem JO - Matematika PY - 1960 SP - 69 EP - 72 VL - 4 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MAT_1960_4_6_a3/ LA - ru ID - MAT_1960_4_6_a3 ER -