@article{10_4064_sm_1996_121_2_1_167_183,
     author = {Charles J. K. Batty and Zdzis{\l}aw Brze\'zniak and David D. Greenfield},
     title = {A quantitative asymptotic theorem for contraction semigroups with countable unitary spectrum},
     journal = {Studia Mathematica},
     pages = {167--183},
     publisher = {mathdoc},
     volume = {121},
     number = {2},
     year = {1996},
     doi = {10.4064/sm_1996_121_2_1_167_183},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm_1996_121_2_1_167_183/}
}