TY - JOUR TI - Problems for Solution JO - Canadian mathematical bulletin PY - 1961 SP - 72 EP - 72 VL - 4 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.1017/S0008439500025613/ DO - 10.1017/S0008439500025613 ID - 10_1017_S0008439500025613 ER -