%0 Journal Article %T GMJ volume 18 issue 1 Cover and Front matter %J Glasgow mathematical journal %D 1977 %P f1-f7 %V 18 %N 1 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089500002937/ %R 10.1017/S0017089500002937 %F 10_1017_S0017089500002937