@article{10_4064_ba59_3_2,
     author = {Robert Dry{\l}o},
     title = {A {Remark} on a {Paper} of {Crachiola} and {Makar-Limanov}},
     journal = {Bulletin of the Polish Academy of Sciences. Mathematics},
     pages = {203--206},
     publisher = {mathdoc},
     volume = {59},
     number = {3},
     year = {2011},
     doi = {10.4064/ba59-3-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ba59-3-2/}
}