Birman, M. Sh.; Pushnitski, A. B. Spectral shift function, amazing and multifaceted. (English) Zbl 0907.47014 Integral Equations Oper. Theory 30, No. 2, 191-199 (1998). MSC: 47B25 47A55 PDF BibTeX XML Cite \textit{M. Sh. Birman} and \textit{A. B. Pushnitski}, Integral Equations Oper. Theory 30, No. 2, 191--199 (1998; Zbl 0907.47014) Full Text: DOI OpenURL
Birman, M. Sh.; Solomyak, M. Z. Asymptotic behavior of the spectrum of differential equations. (English) Zbl 0424.35069 J. Sov. Math. 12, 247-283 (1979). MSC: 35P20 47F05 PDF BibTeX XML Cite \textit{M. Sh. Birman} and \textit{M. Z. Solomyak}, J. Sov. Math. 12, 247--283 (1979; Zbl 0424.35069) Full Text: DOI OpenURL