Albeverio, Sergio A., et al. « Cartan Subalgebras, Weight Spaces, and Criterion of Solvability of Finite Dimensional Leibniz Algebras ». Revista Matemática Complutense, vol. 19, nᵒ 1, avril 2006, p. 183-95, https://doi.org/10.5209/rev_REMA.2006.v19.n1.16652.