TY - JOUR TI - Problems for Solution JO - Canadian mathematical bulletin PY - 1970 SP - 153 EP - 154 VL - 13 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.1017/S0008439500030976/ DO - 10.1017/S0008439500030976 ID - 10_1017_S0008439500030976 ER -