TY - JOUR TI - GMJ volume 29 issue 2 Cover and Front matter JO - Glasgow mathematical journal PY - 1987 SP - f1 EP - f2 VL - 29 IS - 2 UR - http://geodesic.mathdoc.fr/articles/10.1017/S0017089500006765/ DO - 10.1017/S0017089500006765 ID - 10_1017_S0017089500006765 ER -