@article{10_4064_sm195_1_3,
     author = {Bernard Host},
     title = {Ergodic seminorms for commuting transformations
 and applications},
     journal = {Studia Mathematica},
     pages = {31--49},
     year = {2009},
     volume = {195},
     number = {1},
     doi = {10.4064/sm195-1-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm195-1-3/}
}