@article{PMIHES_1966__30__115_0,
     author = {Springer, Tonny A.},
     title = {Some arithmetical results on semi-simple {Lie} algebras},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {115--141},
     year = {1966},
     publisher = {Institut des Hautes Etudes Scientifiques},
     volume = {30},
     mrnumber = {206171},
     zbl = {0156.27002},
     language = {en},
     url = {https://www.numdam.org/item/PMIHES_1966__30__115_0/}
}