TY - JOUR TI - GMJ volume 55 issue 2 Cover and Front matter JO - Glasgow mathematical journal PY - 2013 SP - f1 EP - f2 VL - 55 IS - 2 UR - http://geodesic.mathdoc.fr/articles/10.1017/S0017089513000013/ DO - 10.1017/S0017089513000013 ID - 10_1017_S0017089513000013 ER -