TY - JOUR TI - Ontario Mathematical Meetings 1968 JO - Canadian mathematical bulletin PY - 1968 SP - 621 EP - 652 VL - 11 IS - 4 UR - http://geodesic.mathdoc.fr/articles/10.1017/S0008439500029866/ DO - 10.1017/S0008439500029866 ID - 10_1017_S0008439500029866 ER -