@article{IIGUM_2020_33_a5,
     author = {S. V. Sudoplatov},
     title = {Hierarchy of families of theories and their rank characteristics},
     journal = {The Bulletin of Irkutsk State University. Series Mathematics},
     pages = {80--95},
     publisher = {mathdoc},
     volume = {33},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IIGUM_2020_33_a5/}
}