References
- J. Algebra v.115 Generalized Kac-Moody algebras R. E. Borcherds
- Adv. in Math. v.45 Structure of some categories of representations of infinite dimensional Lie algebras V. V. Deodhar;O. Gabber;V. G. Kac
- Contemporary Mathematics v.194 An exposition of generalized Kac-Moody algebras E. Jurisich
- Infinite Dimensional Lie Algebras(3d ed.) V. G. Kac