@article{CMUC_1992__33_1_a19,
     author = {Schr\"oder, J.},
     title = {Natural sinks on $Y_\beta$},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {173--179},
     publisher = {mathdoc},
     volume = {33},
     number = {1},
     year = {1992},
     mrnumber = {1173759},
     zbl = {0761.18004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1992__33_1_a19/}
}