%0 Journal Article %A Leavitt, W. G. %T Hereditary semisimple classes %J Glasgow mathematical journal %D 1970 %P 7-8 %V 11 %N 1 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089500000781/ %R 10.1017/S0017089500000781 %F 10_1017_S0017089500000781