@article{FPM_2021_23_4_a12,
     author = {V. A. Yaroshevich},
     title = {On regularity of semigroups of maps that preserve a~binary relation},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {225--240},
     publisher = {mathdoc},
     volume = {23},
     number = {4},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2021_23_4_a12/}
}