\Bibitem{Pla84} \by S.~S.~Platonov \paper Invariant subspaces in certain function spaces on an elementary solvable Lie group \jour Mat. Zametki \yr 1984 \vol 35 \issue 1 \pages 19--30 \mathnet{http://mi.mathnet.ru/mzm5611} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=738233} \zmath{https://zbmath.org/?q=an:0558.43004} \transl \jour Math. Notes \yr 1984 \vol 35 \issue 1 \pages 12--18 \crossref{https://doi.org/10.1007/BF01142288} \isi{https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=Publons&SrcAuth=Publons_CEL&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=A1984TK64900003}