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<response><item key="0"><nothing>D I Borisov, Dmitry Zezyulin, "Spacing gain and absorption in a simple PT-symmetric model: spectral singularities and ladders of eigenvalues and resonances", Journal of Physics A: Mathematical and Theoretical, vol. 52, pp. 445202, 2019, [DOI: 10.1088/1751-8121/ab40ec] [IF: 2.00, SJR: 0.85]</nothing></item></response>
