TY  - JOUR
AU  - Okoh, Frank
TI  - Systems that are Purely Simple and Pure Injegtive
JO  - Canadian journal of mathematics
PY  - 1977
SP  - 696
EP  - 700
VL  - 29
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1977-073-4/
DO  - 10.4153/CJM-1977-073-4
ID  - 10_4153_CJM_1977_073_4
ER  -