TY - JOUR TI - GMJ volume 63 issue 3 Cover and Back matter JO - Glasgow mathematical journal PY - 2021 SP - b1 EP - b2 VL - 63 IS - 3 UR - http://geodesic.mathdoc.fr/articles/10.1017/S0017089521000264/ DO - 10.1017/S0017089521000264 ID - 10_1017_S0017089521000264 ER -