@article{GT_2011_15_3_a3,
     author = {Cashen, Christopher~H and Macura, Nata\v{s}a},
     title = {Line patterns in free groups},
     journal = {Geometry & topology},
     pages = {1419--1475},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {2011},
     doi = {10.2140/gt.2011.15.1419},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2011.15.1419/}
}