@article{CMUC_1997__38_3_a2,
     author = {Hasegawa, Shigeru and Sato, Ryotaro},
     title = {On a $d$-parameter ergodic theorem for continuous semigroups of operators satisfying norm conditions},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {453--462},
     publisher = {mathdoc},
     volume = {38},
     number = {3},
     year = {1997},
     mrnumber = {1485067},
     zbl = {0937.47009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1997__38_3_a2/}
}