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Marcel Dekker
Lecture Notes in Pure and Applied Mathematics
International Conference on Trends in Semigroup Theory and Evolution Equations

Diekmann, O., Gyllenberg, M.& Thieme, H. R. (1991). Perturbation theory for dual semigroups. V. Variation of constants formulas. Proceedings of the 2nd International Conference on Trends in Semigroup Theory and Evolution Equations 1989 (2), 107–123.