@article{FPM_1998_4_4_a14,
     author = {S. S. Marchenkov},
     title = {The~invariants of {Post} classes},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {1385--1404},
     publisher = {mathdoc},
     volume = {4},
     number = {4},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_1998_4_4_a14/}
}