@article{MOMA_1981__91_178007,
     author = {Karl Petersen and Shizuo Kakutani},
     title = {The {Speed} of {Convergence} in {Ergodic} {Theorem.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {11--18},
     publisher = {mathdoc},
     volume = {91},
     year = {1981},
     zbl = {0446.28015},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1981__91_178007/}
}