@article{PM_2009_2009_1_a20,
     author = {Gautero, M. and  Heusener and  M.},
     title = {Cohomological characterization of relative hyperbolicity and combination theorem.},
     journal = {Publicacions matem\`atiques},
     pages = {489-514},
     publisher = {mathdoc},
     volume = {53},
     number = {2},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PM_2009_2009_1_a20/}
}