1. Chari, V., Ilangovan, S.: On the Harishchandra homomorphism for infinite dimensional Lie algebras. To appear in the Journal of Algebra
2. Duflo, M.: Construction of primitive ideals in an enveloping algebra, Lie groups and their representations. Summer School in Mathematics, edited by I. M. Gelfand, Bolyai-Janov Math. Soc., Budapest (1971)
3. Kac, V.G.: Simple irreducible graded Lie algebras of finite growth. Math. USSR Izv.2, 1271?1311 (1968)
4. ?: Infinite-dimensional algebras, Dedekinds ?-function, classical Mobius function and the very strange formula. Advances in Mathematics30, 85?136 (1978)
5. Progress in Mathematics;V.G. Kac,1983