Geodesic
Purely imaginary eigenvalues of operator semigroups.
Semigroup forum, Tome 51 (1995) no. 1, pp. 335-342.

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Mots-clés : -contraction semigroup, nonlinear nonexpansive maps 
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     author = {W.M. Ruess},
     title = {Purely imaginary eigenvalues of operator semigroups.},
     journal = {Semigroup forum},
     pages = {335--342},
     publisher = {mathdoc},
     volume = {51},
     number = {1},
     year = {1995},
     zbl = {0831.47031},
     url = {http://geodesic.mathdoc.fr/item/SF_1995__51_1_135420/}
}
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W.M. Ruess. Purely imaginary eigenvalues of operator semigroups.. Semigroup forum, Tome 51 (1995) no. 1, pp. 335-342. http://geodesic.mathdoc.fr/item/SF_1995__51_1_135420/