TY  - JOUR
AU  - Umar, Abdullahi
TI  - On the ranks of certain finite semigroups of order-decreasing transformations.
JO  - Portugaliae mathematica
PY  - 1996
SP  - 23
EP  - 34
VL  - 53
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1996__53_1_47476/
LA  - en
ID  - PORMA_1996__53_1_47476
ER  -