@article{MZM_1973_13_5_a11,
     author = {V. V. Gorlov},
     title = {On congruences in closed post classes},
     journal = {Matemati\v{c}eskie zametki},
     pages = {725--734},
     publisher = {mathdoc},
     volume = {13},
     number = {5},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_13_5_a11/}
}