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Lévai, G.; Znojil, M. Conditions for complex spectra in a class of \(PT\) symmetric potentials. (English) Zbl 1138.81390 Mod. Phys. Lett. A 16, No. 30, 1973-1981 (2001). MSC: 81Q05 81V15 PDF BibTeX XML Cite \textit{G. Lévai} and \textit{M. Znojil}, Mod. Phys. Lett. A 16, No. 30, 1973--1981 (2001; Zbl 1138.81390) Full Text: DOI arXiv OpenURL