TY - JOUR TI - Thomas Murray MacRobert JO - Glasgow mathematical journal PY - 1963 SP - 57 EP - 64 VL - 6 IS - 2 UR - http://geodesic.mathdoc.fr/articles/10.1017/S2040618500034742/ DO - 10.1017/S2040618500034742 ID - 10_1017_S2040618500034742 ER -