@article{10_4064_sm_61_1_21_24,
     author = {S. McGrath},
     title = {Abelian ergodic theorems for contraction semigroups},
     journal = {Studia Mathematica},
     pages = {21--24},
     year = {1977},
     volume = {61},
     number = {1},
     doi = {10.4064/sm-61-1-21-24},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-61-1-21-24/}
}