@article{10_4064_fm_157_2_3_209_220,
     author = {W. Geller and M. Pollicott},
     title = {An entropy for $\ensuremath{\mathbb{Z}}^2$ -actions with finite entropy generators},
     journal = {Fundamenta Mathematicae},
     pages = {209--220},
     publisher = {mathdoc},
     volume = {157},
     number = {2},
     year = {1998},
     doi = {10.4064/fm-157-2-3-209-220},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-157-2-3-209-220/}
}