@incollection{AST_1977__49__115_0,
     author = {Kami\'nski, B.},
     title = {Spectrum of two-dimensional dynamical systems with completely positive entropy},
     booktitle = {Syst\`eme dynamique I - Varsovie},
     series = {Ast\'erisque},
     pages = {115--116},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {49},
     year = {1977},
     mrnumber = {486413},
     zbl = {0376.28010},
     language = {en},
     url = {http://www.numdam.org/item/AST_1977__49__115_0/}
}