@article{10_4064_fm_160_3_247_254,
     author = {Zolt\'an Buczolich},
     title = {Ergodic averages and free $\ensuremath{\mathbb{Z}}^2$ actions},
     journal = {Fundamenta Mathematicae},
     pages = {247--254},
     publisher = {mathdoc},
     volume = {160},
     number = {3},
     year = {1999},
     doi = {10.4064/fm-160-3-247-254},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-160-3-247-254/}
}