@article{DM_1997_9_1_a5,
     author = {V. B. Alekseev},
     title = {Minimal extensions with simple multiplication for an algebra of second-order matrices},
     journal = {Diskretnaya Matematika},
     pages = {71--82},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1997_9_1_a5/}
}