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Denk, Robert; Möller, Manfred; Tretter, Christiane (2006). The spectrum of the multiplication operator associated with a family of operators in a Banach space. In: Förster, Karl-Heinz; Jonas, Peter; Langer, Heinz (eds.) Operator theory in Krein spaces and nonlinear eigenvalue problems. Operator Theory: Advances and Applications: Vol. 162 (pp. 103-116). Basel: Birkhäuser 10.1007/3-7643-7453-5_6