Naboko, S. N.; Faddeev, M. M. Operators of the Friedrichs model that are similar to a selfadjoint operator. (Russian. English summary) Zbl 1268.47023 Vestn. Leningrad. Univ., Ser. 4, Fiz. Khim. 1990, No. 4, 78-82 (1990). Cited in 2 Documents MSC: 47A55 Perturbation theory of linear operators 47B40 Spectral operators, decomposable operators, well-bounded operators, etc. 47B25 Linear symmetric and selfadjoint operators (unbounded) PDFBibTeX XMLCite \textit{S. N. Naboko} and \textit{M. M. Faddeev}, Vestn. Leningrad. Univ., Ser. 4, Fiz. Khim. 1990, No. 4, 78--82 (1990; Zbl 1268.47023)