@article{IVM_1991_3_a14,
     author = {V. D. Derech},
     title = {Quasi-orders on some inverse semigroups},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {76--78},
     publisher = {mathdoc},
     number = {3},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1991_3_a14/}
}