@article{10_37236_2458,
     author = {Demetres Christofides and David Ellis and Peter Keevash},
     title = {An approximate vertex-isoperimetric inequality for \(r\)-sets},
     journal = {The electronic journal of combinatorics},
     year = {2013},
     volume = {20},
     number = {4},
     doi = {10.37236/2458},
     zbl = {1300.05308},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/2458/}
}