\Bibitem{Ole71} \by V.~A.~Oleinikov \paper Algebraic functions with separated singularities \jour Math. USSR-Izv. \yr 1971 \vol 5 \issue 6 \pages 1303--1324 \mathnet{http://mi.mathnet.ru/eng/im2172} \crossref{https://doi.org/10.1070/IM1971v005n06ABEH001236} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=296075} \zmath{https://zbmath.org/?q=an:0231.32006}