\Bibitem{Uzk38} \by A.~I.~Uzkow \paper On the Jordan-H\"older theorem \jour Sb. Math. \yr 1938 \vol 46 \issue 1 \mathnet{http://mi.mathnet.ru/eng/sm5735} \zmath{https://zbmath.org/?q=an:0020.20603|64.0961.05}