%0 Journal Article %T GMJ volume 20 issue 2 Cover and Back matter %J Glasgow mathematical journal %D 1979 %P b1-b1 %V 20 %N 2 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089500003773/ %R 10.1017/S0017089500003773 %F 10_1017_S0017089500003773