@incollection{AST_1977__50__151_0,
     author = {Krengel, Ulrich},
     title = {Recent progress on ergodic theorems},
     booktitle = {Syst\`emes dynamiques II - Varsovie},
     series = {Ast\'erisque},
     pages = {151--192},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {50},
     year = {1977},
     mrnumber = {486418},
     zbl = {0376.28016},
     language = {en},
     url = {http://www.numdam.org/item/AST_1977__50__151_0/}
}