@article{GT_2005_9_1_a11,
     author = {Kapovich, Ilya and Weidmann, Richard},
     title = {Kleinian groups and the rank problem},
     journal = {Geometry & topology},
     pages = {375--402},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {2005},
     doi = {10.2140/gt.2005.9.375},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2005.9.375/}
}