@article{10_4171_ggd_146,
     author = {R\'emi Coulon},
     title = {Asphericity and small cancellation theory for  rotation families of groups},
     journal = {Groups, geometry, and dynamics},
     pages = {729--765},
     year = {2011},
     volume = {5},
     number = {4},
     doi = {10.4171/ggd/146},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/146/}
}