Behrndt, Jussi; Luger, Annemarie; Trunk, Carsten On the negative squares of a class of self-adjoint extensions in Krein spaces. (English) Zbl 1275.47084 Math. Nachr. 286, No. 2-3, 118-148 (2013). Reviewer: Andreas Fleige (Dortmund) MSC: 47B50 30E20 30J10 34B07 PDFBibTeX XMLCite \textit{J. Behrndt} et al., Math. Nachr. 286, No. 2--3, 118--148 (2013; Zbl 1275.47084) Full Text: DOI Link
Clarke, Robert J.; Foata, Dominique Eulerian calculus. III: The ubiquitous Cauchy formula. (English) Zbl 0826.05058 Eur. J. Comb. 16, No. 4, 329-355 (1995). MSC: 05E15 05E05 05E10 05A05 PDFBibTeX XMLCite \textit{R. J. Clarke} and \textit{D. Foata}, Eur. J. Comb. 16, No. 4, 329--355 (1995; Zbl 0826.05058) Full Text: DOI
Dunford, Nelson; Schwartz, Jacob T. [Bade, William G.; Bartle, Robert G.] Linear operators. Part II: Spectral theory, self adjoint operators in Hilbert space. With the assistance of William G. Bade and Robert G. Bartle. Repr. of the orig., publ. 1963 by John Wiley & Sons Ltd., Paperback ed. (English) Zbl 0635.47002 Wiley Classics Library. New York etc.: John Wiley & Sons Ltd./Interscience Publishers, Inc. ix, 859-1923 $25.95 (1988). MSC: 47-02 47B15 47F05 47B25 46J05 22B05 47D03 47E05 47A10 43A45 47B10 47B38 47A20 PDFBibTeX XMLCite \textit{N. Dunford} and \textit{J. T. Schwartz}, Linear operators. Part II: Spectral theory, self adjoint operators in Hilbert space. With the assistance of William G. Bade and Robert G. Bartle. Repr. of the orig., publ. 1963 by John Wiley \& Sons Ltd., Paperback ed. New York etc: John Wiley \&| Sons Ltd./Interscience Publishers, Inc. (1988; Zbl 0635.47002)