\Bibitem{BirSus05} \by M.~Sh.~Birman, T.~A.~Suslina \paper Threshold approximations for the resolvent of a~factoried selfadjoint family with corrector \jour Algebra i Analiz \yr 2005 \vol 17 \issue 5 \pages 69--90 \mathnet{http://mi.mathnet.ru/aa706} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=2241423} \zmath{https://zbmath.org/?q=an:1121.47031} \transl \jour St. Petersburg Math. J. \yr 2006 \vol 17 \issue 5 \pages 745--762 \crossref{https://doi.org/10.1090/S1061-0022-06-00927-7}