\Bibitem{Nai48} \by M.~A.~Naimark \paper Rings with involutions \jour Russian Math. Surveys \yr 1948 \vol 3 \issue 5 \mathnet{http://mi.mathnet.ru//eng/rm8759} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=27448} \zmath{https://zbmath.org/?q=an:0036.07701}