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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.& Verduyn Lunel, S. (1991). A new short proof of an old folk theorem in functional-differential equations. Proceedings of the 2nd International Conference on Trends in Semigroup Theory and Evolution Equations 1989 (2), 101–106.