@article{10_4171_ggd_139,
     author = {Michael Stoll},
     title = {Reduction theory of point clusters in projective space},
     journal = {Groups, geometry, and dynamics},
     pages = {553--565},
     year = {2011},
     volume = {5},
     number = {2},
     doi = {10.4171/ggd/139},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/139/}
}