@article{CHEB_2021_22_4_a8,
     author = {V. B. Poplavski},
     title = {Partial orders and idempotents of monoids},
     journal = {\v{C}eby\v{s}evskij sbornik},
     pages = {183--199},
     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CHEB_2021_22_4_a8/}
}