@article{GT_2013_17_1_a7,
     author = {Avramidi, Grigori},
     title = {Periodic flats and group actions on locally symmetric spaces},
     journal = {Geometry & topology},
     pages = {311--327},
     publisher = {mathdoc},
     volume = {17},
     number = {1},
     year = {2013},
     doi = {10.2140/gt.2013.17.311},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2013.17.311/}
}