TY - JOUR TI - GMJ volume 59 issue 2 Cover and Front matter JO - Glasgow mathematical journal PY - 2017 SP - f1 EP - f2 VL - 59 IS - 2 UR - http://geodesic.mathdoc.fr/articles/10.1017/S0017089517000015/ DO - 10.1017/S0017089517000015 ID - 10_1017_S0017089517000015 ER -