\Bibitem{Dub37} \by P.~E.~Dubuque \paper Sur le th\'eor\`eme de Frobenius \jour Sb. Math. \yr 1937 \vol 44 \issue 6 \mathnet{http://mi.mathnet.ru/eng/sm5650} \zmath{https://zbmath.org/?q=an:0018.20402|63.0860.02}