\Bibitem{Ito57} \by K.~Ito \paper On stochastic differential equations \jour Matematika \yr 1957 \vol 1 \issue 1 \pages 78--116 \mathnet{http://mi.mathnet.ru/mat6} \mathscinet{https://mathscinet.ams.org/mathscinet-getitem?mr=0040618}