%0 Journal Article %A A. V. Litavrin %T On alternating semigroups of endomorphisms of a groupoid %J Matematičeskie trudy %D 2024 %P 73-95 %V 27 %N 1 %U http://geodesic.mathdoc.fr/item/MT_2024_27_1_a1/ %G ru %F MT_2024_27_1_a1