@article{10_1017_S0017089500002512,
     author = {Kopp, P. E.},
     title = {Abelian ergodic theorems for vector-valued functions},
     journal = {Glasgow mathematical journal},
     pages = {57--60},
     year = {1975},
     volume = {16},
     number = {1},
     doi = {10.1017/S0017089500002512},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500002512/}
}