%0 Journal Article
%A Okoh, Frank
%T Systems that are Purely Simple and Pure Injegtive
%J Canadian journal of mathematics
%D 1977
%P 696-700
%V 29
%N 4
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1977-073-4/
%R 10.4153/CJM-1977-073-4
%F 10_4153_CJM_1977_073_4