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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. In Proceedings of the 2nd International Conference on Trends in Semigroup Theory and Evolution Equations 1989 (2) (pp. 107–123). Marcel Dekker.