@article{AUCMP_1992_33_2_a15,
     author = {Ricker, W. J.},
     title = {Examples of stable $C_0$-semigroups},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {121--128},
     year = {1992},
     volume = {33},
     number = {2},
     mrnumber = {1287233},
     zbl = {0849.47020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_1992_33_2_a15/}
}