\Bibitem{KakShe80} \by V.~A.~Kakichev, V.~M.~Shelkovich \paper Riemann problem for $p$-cone in Vladimirov algebras \jour Mat. Zametki \yr 1980 \vol 27 \issue 6 \pages 899--911 \mathnet{http://mi.mathnet.ru/mzm6479} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=580066} \zmath{https://zbmath.org/?q=an:0449.46037|0442.46030} \transl \jour Math. Notes \yr 1980 \vol 27 \issue 6 \pages 432--438 \crossref{https://doi.org/10.1007/BF01145431} \isi{https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=Publons&SrcAuth=Publons_CEL&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=A1980KZ74800020}