@article{SF_1995__50_3_135383,
     author = {J.B. Baillon and S. Guerre-Delabri\`ere},
     title = {Optimal properties of contraction semigroups in {Banach} spaces.},
     journal = {Semigroup forum},
     pages = {247--250},
     publisher = {mathdoc},
     volume = {50},
     number = {3},
     year = {1995},
     zbl = {0827.47032},
     url = {http://geodesic.mathdoc.fr/item/SF_1995__50_3_135383/}
}