\Bibitem{Kat62} \by G.~I.~Kats \paper Finite rings groups \jour Dokl. Akad. Nauk SSSR \yr 1962 \vol 147 \issue 1 \pages 21--24 \mathnet{http://mi.mathnet.ru/dan27160} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=0145366} \zmath{https://zbmath.org/?q=an:0141.12402}