%0 Journal Article %A Popoola, J. O. %A Tweddle, I. %T On the closed graph theorem %J Glasgow mathematical journal %D 1976 %P 89-97 %V 17 %N 2 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089500002780/ %R 10.1017/S0017089500002780 %F 10_1017_S0017089500002780