@article{GT_2011_15_2_a9,
     author = {Guirardel, Vincent and Levitt, Gilbert},
     title = {Trees of cylinders and canonical splittings},
     journal = {Geometry & topology},
     pages = {977--1012},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {2011},
     doi = {10.2140/gt.2011.15.977},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2011.15.977/}
}