Falomir, H. A.; Pisani, P. A. G. Spectral functions of non-essentially self-adjoint operators. (English) Zbl 1252.81117 J. Phys. A, Math. Theor. 45, No. 37, Article ID 374017, 43 p. (2012). MSC: 81T55 Casimir effect in quantum field theory 81Q12 Nonselfadjoint operator theory in quantum theory including creation and destruction operators 81Q10 Selfadjoint operator theory in quantum theory, including spectral analysis PDF BibTeX XML Cite \textit{H. A. Falomir} and \textit{P. A. G. Pisani}, J. Phys. A, Math. Theor. 45, No. 37, Article ID 374017, 43 p. (2012; Zbl 1252.81117) Full Text: DOI arXiv