%0 Journal Article %T GMJ volume 21 issue 1 Front matter %J Glasgow mathematical journal %D 1980 %P f1-f5 %V 21 %N 1 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089500003906/ %R 10.1017/S0017089500003906 %F 10_1017_S0017089500003906