Geodesic
Perturbation of the generating operator of an analytic semigroup
Funkcionalʹnyj analiz i ego priloženiâ, Tome 22 (1988) no. 1, pp. 62-63 
L. M. Gershtein. Perturbation of the generating operator of an analytic semigroup. Funkcionalʹnyj analiz i ego priloženiâ, Tome 22 (1988) no. 1, pp. 62-63. http://geodesic.mathdoc.fr/item/FAA_1988_22_1_a7/
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] Kato T., Teoriya vozmuschenii lineinykh operatorov, Mir, M., 1966

[2] Gershtein L.M., Kachestvennye i priblizhennye metody issledovaniya operatornykh uravnenii, Yaroslavl, 1986, 7–11 | MR

[3] Gershtein L.M., Sobolevskii P.E., DAN USSR, 1980, no. 10, 9–12 | MR

[4] Krein S.G., Lineinye differentsialnye uravneniya v banakhovom prostranstve, Nauka, M., 1967 | MR