@article{10_4171_ggd_213,
     author = {Robert Young},
     title = {Filling inequalities for nilpotent groups through approximations},
     journal = {Groups, geometry, and dynamics},
     pages = {977--1011},
     year = {2013},
     volume = {7},
     number = {4},
     doi = {10.4171/ggd/213},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/213/}
}