TY - JOUR TI - Corrections JO - Canadian mathematical bulletin PY - 1972 SP - 148 EP - 148 VL - 15 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1972-030-1/ DO - 10.4153/CMB-1972-030-1 ID - 10_4153_CMB_1972_030_1 ER -