TY - JOUR TI - GMJ volume 33 issue 3 Cover and Front matter JO - Glasgow mathematical journal PY - 1991 SP - f1 EP - f2 VL - 33 IS - 3 UR - http://geodesic.mathdoc.fr/articles/10.1017/S0017089500008284/ DO - 10.1017/S0017089500008284 ID - 10_1017_S0017089500008284 ER -