\Bibitem{PozSak91} \by S.~M.~Pozin, L.~A.~Sakhnovich \paper A~two-sided bound on the lowest eigenvalue of an operator that characterizes stable processes \jour Teor. Veroyatnost. i Primenen. \yr 1991 \vol 36 \issue 2 \pages 368--370 \mathnet{http://mi.mathnet.ru/tvp2839} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=1119514} \zmath{https://zbmath.org/?q=an:0774.60019|0727.60019} \transl \jour Theory Probab. Appl. \yr 1991 \vol 36 \issue 2 \pages 385--388 \crossref{https://doi.org/10.1137/1136045} \isi{https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=Publons&SrcAuth=Publons_CEL&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=A1991JB57800020}