A perturbation theorem for semigroups of linear operators
Séminaire de probabilités de Strasbourg, Tome 22 (1988), pp. 89-91. 
@article{SPS_1988__22__89_0,
     author = {Yan, Jia-An},
     title = {A perturbation theorem for semigroups of linear operators},
     journal = {S\'eminaire de probabilit\'es de Strasbourg},
     pages = {89--91},
     publisher = {Springer - Lecture Notes in Mathematics},
     volume = {22},
     year = {1988},
     mrnumber = {960513},
     zbl = {0651.47030},
     language = {fr},
     url = {http://www.numdam.org/item/SPS_1988__22__89_0/}
}
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Yan, Jia-An. A perturbation theorem for semigroups of linear operators. Séminaire de probabilités de Strasbourg, Tome 22 (1988), pp. 89-91. http://www.numdam.org/item/SPS_1988__22__89_0/

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[3]. K. Yosida. Functional Analysis, 4th edition. Springer 1978. | MR