@article{10_4171_ggd_37,
     author = {Fr\'ed\'eric Haglund and Jacek \'Swi\k{a}tkowski},
     title = {Separating quasi-convex subgroups in 7-systolic groups},
     journal = {Groups, geometry, and dynamics},
     pages = {223--244},
     year = {2008},
     volume = {2},
     number = {2},
     doi = {10.4171/ggd/37},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/37/}
}