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@article{SF_1978__16_134276, author = {J. Goldstein and c. Radin and R. Showalter}, title = {Convergence rates of ergodic limits for semigroups and cosine functions.}, journal = {Semigroup forum}, pages = {89--96}, publisher = {mathdoc}, volume = {16}, year = {1978}, zbl = {0393.47004}, url = {http://geodesic.mathdoc.fr/item/SF_1978__16_134276/} }
J. Goldstein; c. Radin; R. Showalter. Convergence rates of ergodic limits for semigroups and cosine functions.. Semigroup forum, Tome 16 (1978), pp. 89-96. http://geodesic.mathdoc.fr/item/SF_1978__16_134276/