TY  - JOUR
AU  - Cordes, Craig M.
TI  - Semigroups of non-negative integral matrices
JO  - Glasgow mathematical journal
PY  - 1974
SP  - 39
EP  - 42
VL  - 15
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.1017/S0017089500002081/
DO  - 10.1017/S0017089500002081
ID  - 10_1017_S0017089500002081
ER  -