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Tretter, Christiane (2021). Eigenvalue accumulation and bounds for non-selfadjoint matrix differential operators related to NLS. In: Exner, Pavel; Frank, Rupert L.; Gesztesy, Fritz; Holden, Helge; Weidl, Timo (eds.) Partial differential equations, spectral theory, and mathematical physics. EMS Series of Congress Reports (pp. 445-456). European Mathematical Society 10.4171/ECR/18-1/26
