@article{JOLT_2010_20_4_a3,
     author = {Rudolf Philippe Rohr},
     title = {Principal {Basis} in {Cartan} {Subalgebra}},
     journal = {Journal of Lie Theory},
     pages = {673--687},
     year = {2010},
     volume = {20},
     number = {4},
     url = {http://geodesic.mathdoc.fr/item/JOLT_2010_20_4_a3/}
}