@incollection{AST_1977__50__311_0,
     author = {Moulin Ollagnier, Jean and Pinchon, Didier},
     title = {A note about {Hedlund's} theorem},
     booktitle = {Syst\`emes dynamiques II - Varsovie},
     series = {Ast\'erisque},
     pages = {311--313},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {50},
     year = {1977},
     mrnumber = {500875},
     zbl = {0375.54032},
     language = {en},
     url = {http://www.numdam.org/item/AST_1977__50__311_0/}
}