@article{SM_1989_63_1_a13,
     author = {A. V. Mikhalev},
     title = {Multiplicative classification of associative rings},
     journal = {Sbornik. Mathematics},
     pages = {205--218},
     publisher = {mathdoc},
     volume = {63},
     number = {1},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1989_63_1_a13/}
}