@article{SM_2010_201_4_a1,
     author = {A. G. Kachurovskii and A. V. Reshetenko},
     title = {On the rate of convergence in von {Neumann's} ergodic theorem with continuous time},
     journal = {Sbornik. Mathematics},
     pages = {493--500},
     publisher = {mathdoc},
     volume = {201},
     number = {4},
     year = {2010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2010_201_4_a1/}
}