%0 Journal Article
%A A. Umar
%T On certain semigroups of contraction mappings of a~finite chain
%J Algebra and discrete mathematics
%D 2021
%P 299-320
%V 32
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/ADM_2021_32_2_a10/
%G en
%F ADM_2021_32_2_a10