@article{10_4171_ggd_218,
     author = {Thierry Coulbois and Arnaud Hilion},
     title = {Rips induction: index of the dual lamination of an $\mathbb{R}$-tree},
     journal = {Groups, geometry, and dynamics},
     pages = {97--134},
     year = {2014},
     volume = {8},
     number = {1},
     doi = {10.4171/ggd/218},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/218/}
}