@article{10_4171_ggd_380,
     author = {Michael Levin and Uri Shapira and Barak Weiss},
     title = {Closed orbits for the diagonal group and well-rounded lattices},
     journal = {Groups, geometry, and dynamics},
     pages = {1211--1225},
     year = {2016},
     volume = {10},
     number = {4},
     doi = {10.4171/ggd/380},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/380/}
}