%0 Journal Article %T GMJ volume 39 issue 3 Cover and Front matter %J Glasgow mathematical journal %D 1997 %P f1-f7 %V 39 %N 3 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089500032146/ %R 10.1017/S0017089500032146 %F 10_1017_S0017089500032146