@incollection{AST_1978__51__443_0,
     author = {Wojtkowski, Maciej},
     title = {Oscillating geodesics on $2$-dimensional manifolds},
     booktitle = {Syst\`emes dynamiques III - Varsovie},
     series = {Ast\'erisque},
     pages = {443--456},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {51},
     year = {1978},
     mrnumber = {488171},
     zbl = {0414.58026},
     language = {en},
     url = {http://www.numdam.org/item/AST_1978__51__443_0/}
}