%0 Journal Article %A A. A. Stepanova %T $S$-acts over a well-ordered monoid with modular congruence lattice %J The Bulletin of Irkutsk State University. Series Mathematics %D 2021 %P 87-102 %V 35 %I mathdoc %U http://geodesic.mathdoc.fr/item/IIGUM_2021_35_a6/ %G en %F IIGUM_2021_35_a6