@incollection{AST_1978__51__457_0,
     author = {Ziemian, Krystyna Ma{\l}gorzata},
     title = {On topological and measure entropies of semigroups},
     booktitle = {Syst\`emes dynamiques III - Varsovie},
     series = {Ast\'erisque},
     pages = {457--472},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {51},
     year = {1978},
     mrnumber = {480950},
     zbl = {0376.28017},
     language = {en},
     url = {http://www.numdam.org/item/AST_1978__51__457_0/}
}