TY - JOUR TI - Solution JO - Canadian mathematical bulletin PY - 1962 SP - 196 EP - 200 VL - 5 IS - 2 UR - http://geodesic.mathdoc.fr/articles/10.1017/S0008439500026138/ DO - 10.1017/S0008439500026138 ID - 10_1017_S0008439500026138 ER -