TY - JOUR TI - Problems for Solution JO - Canadian mathematical bulletin PY - 1969 SP - 354 EP - 355 VL - 12 IS - 3 UR - http://geodesic.mathdoc.fr/articles/10.1017/S000843950003040X/ DO - 10.1017/S000843950003040X ID - 10_1017_S000843950003040X ER -