@article{IVM_1962_2_a14,
     author = {M. B. Pergamenshchikov},
     title = {On $H$-congruences},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {114--118},
     publisher = {mathdoc},
     number = {2},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1962_2_a14/}
}