@article{AM_1999_150_3_a0,
     author = {Edward R. Goetze and Ralf J. Spatzier},
     title = {Smooth classification of {Cartan} actions of higher rank semisimple {Lie} groups and their lattices},
     journal = {Annals of mathematics},
     publisher = {mathdoc},
     volume = {150},
     number = {3},
     year = {1999},
     url = {http://geodesic.mathdoc.fr/item/AM_1999_150_3_a0/}
}