TY  - JOUR
AU  - A. Umar
TI  - On certain semigroups of contraction mappings of a~finite chain
JO  - Algebra and discrete mathematics
PY  - 2021
SP  - 299
EP  - 320
VL  - 32
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ADM_2021_32_2_a10/
LA  - en
ID  - ADM_2021_32_2_a10
ER  -