@article{DAN_1961_136_6_a7,
     author = {S. R. Kogalovskii},
     title = {A general method of obtaining the structural characteristics of axiomatized classes},
     journal = {Doklady Akademii Nauk},
     pages = {1291--1294},
     publisher = {mathdoc},
     volume = {136},
     number = {6},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_136_6_a7/}
}