1. Arnol’d, V.I., Gusein-Zade, S.M., Varchenko, A.N.: Singularities of Differential Maps, Vol. 1, The Classification of Critical Points, Caustics and Wave Fronts. Translated from the Russian by Ian Porteous and Mark Reynolds. In: Monographs in Mathematics, Vol. 82, Pp. Xi+ 382. Birkhäauser Boston, Inc., Boston, MA (1985)
2. Benson, M., Yau, S.S.-T.: Lie algebra and their representations arising from isolated singularities: Computer Method in Calculating the Lie Algebras and Their Cohomology, Advanced Studies in Pure Mathematics. Complex Analytic Singularities, North-Holland, Amsterdam, pp. 3–58 (1987)
3. Benson, M., Yau, S.S.-T.: Equivalence between isolated hypersurface singularities. Math. Ann. 287, 107–134 (1990)
4. Bratzlavsky, F.: Sur les algèbres admettant un tore d’automorphismes donné. J. Algebra 30, 305–316 (1974)
5. Brieskorn, E.: Singular elements of semi-simple algebraic groups. Actes congres intern. Math. 2, 279–284 (1970)