@article{10_2140_agt_2014_14_2783,
     author = {Hanlon, Richard Gaelan and Mart{\'\i}nez-Pedroza, Eduardo},
     title = {Lifting group actions, equivariant towers and subgroups of non-positively curved groups},
     journal = {Algebraic and Geometric Topology},
     pages = {2783--2808},
     year = {2014},
     volume = {14},
     number = {5},
     doi = {10.2140/agt.2014.14.2783},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2014.14.2783/}
}