Geodesic
Pertubation and comparison of cosine operator functions.
Semigroup forum, Tome 51 (1995) no. 1, pp. 225-246.

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Mots-clés : abstract Cauchy problem, well-posed, multiplicative perturbation theorems, additive perturbation theorems, mixed-type perturbation theorems, infinitesimal comparison of two cosine operator functions 
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     author = {S. Piskarev and S.YX. Shaw},
     title = {Pertubation and comparison of cosine operator functions.},
     journal = {Semigroup forum},
     pages = {225--246},
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     year = {1995},
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S. Piskarev; S.YX. Shaw. Pertubation and comparison of cosine operator functions.. Semigroup forum, Tome 51 (1995) no. 1, pp. 225-246. http://geodesic.mathdoc.fr/item/SF_1995__51_1_135411/