Beltiţă, Ingrid On an abstract radiation condition. (English) Zbl 0991.47500 RIMS Kokyuroku 1208, 80-90 (2001). MSC: 47A10 Spectrum, resolvent 47B25 Linear symmetric and selfadjoint operators (unbounded) PDF BibTeX XML Cite \textit{I. Beltiţă}, RIMS Kokyuroku 1208, 80--90 (2001; Zbl 0991.47500)