@article{JLT_2015_25_1_JLT_2015_25_1_a6,
     author = {P. Bravi and G. Pezzini},
     title = {The {Spherical} {Systems} of the {Wonderful} {Reductive} {Subgroups}},
     journal = {Journal of Lie theory},
     pages = {105--123},
     year = {2015},
     volume = {25},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/JLT_2015_25_1_JLT_2015_25_1_a6/}
}