@article{GT_2003_7_2_a10,
     author = {Dahmani, Francois},
     title = {Combination of convergence groups},
     journal = {Geometry & topology},
     pages = {933--963},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {2003},
     doi = {10.2140/gt.2003.7.933},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2003.7.933/}
}