@article{JEMS_2007_9_1_a1,
     author = {Laurent Bonavero and Cinzia Casagrande and St\'ephane Druel},
     title = {On covering and quasi-unsplit families of curves},
     journal = {Journal of the European Mathematical Society},
     pages = {45--57},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {2007},
     doi = {10.4171/jems/71},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/71/}
}