@article{GT_2011_15_3_a6,
     author = {Le Roux, Fr\'ed\'eric},
     title = {Free planar actions of the {Klein} bottle group},
     journal = {Geometry & topology},
     pages = {1545--1567},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {2011},
     doi = {10.2140/gt.2011.15.1545},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2011.15.1545/}
}