@article{MZ_1982__179_173133,
     author = {Wim H. Hesselink},
     title = {Special and {Pure} {Gradings} of {Lie} {Algebras.}},
     journal = {Mathematische Zeitschrift},
     pages = {135--150},
     year = {1982},
     volume = {179},
     zbl = {0455.17007},
     url = {http://geodesic.mathdoc.fr/item/MZ_1982__179_173133/}
}