@article{MZM_2020_108_4_a6,
     author = {K. H. Hovsepyan},
     title = {Inverse {Subsemigroups} of the {Bicyclic} {Semigroup}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {552--560},
     publisher = {mathdoc},
     volume = {108},
     number = {4},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2020_108_4_a6/}
}