\Bibitem{Gur48}
\by L.~S.~Gurin
\paper On an interpolation problem
\jour Sb. Math.
\yr 1948
\vol 64
\issue 3
\mathnet{http://mi.mathnet.ru//eng/sm6085}
\mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=25567}
\zmath{https://zbmath.org/?q=an:0031.02305}