@article{10_4064_fm203_1_2,
     author = {Enhui Shi and Suhua Wang},
     title = {The ping-pong game, geometric entropy and expansiveness
 for group actions on {Peano} continua having free dendrites},
     journal = {Fundamenta Mathematicae},
     pages = {21--37},
     publisher = {mathdoc},
     volume = {203},
     number = {1},
     year = {2009},
     doi = {10.4064/fm203-1-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm203-1-2/}
}