TY - JOUR TI - GMJ volume 35 issue 3 Cover and Front matter JO - Glasgow mathematical journal PY - 1993 SP - f1 EP - f8 VL - 35 IS - 3 UR - http://geodesic.mathdoc.fr/articles/10.1017/S0017089500009848/ DO - 10.1017/S0017089500009848 ID - 10_1017_S0017089500009848 ER -