\Bibitem{RotShe85} \by V.~I.~Rotar', T.~L.~{\v S}erva{\v s}idze \paper Several estimates for the distributions of quadratic forms \jour Teor. Veroyatnost. i Primenen. \yr 1985 \vol 30 \issue 3 \pages 549--554 \mathnet{http://mi.mathnet.ru/tvp2034} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=805309} \zmath{https://zbmath.org/?q=an:0595.60022|0578.60020} \transl \jour Theory Probab. Appl. \yr 1986 \vol 30 \issue 3 \pages 585--590 \crossref{https://doi.org/10.1137/1130072} \isi{https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=Publons&SrcAuth=Publons_CEL&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=A1986E186100016}