@article{DAN_1969_189_5_a0,
     author = {V. A. Andrunakievich and Yu. M. Ryabukhin},
     title = {Direct sums of division algebras},
     journal = {Doklady Akademii Nauk},
     pages = {927--929},
     publisher = {mathdoc},
     volume = {189},
     number = {5},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_189_5_a0/}
}