REFERENCES
- Nippi , C. R. and Witten , E. 1993 . A WZW model based on a non-semi-simple group . Phys. Rev. Lett , 71 : 3751
- Sfetsos , K. 1994 . Gauging a non-semi-simple WZW model . Phys. Lett. B , 324 : 335
- Mohammedi , N. 1994 . On bosonic and supersymmetric current algebras for non-semisimple group . Phys. Lett. B , 325 : 371
- Bourbaki , N. 1971 . Groupes et algebres de Lie Hermann, , Paris
- Benayadi , S. 1997 . A new characterization of semisimple Lie algebras . Proc. Amer. Math. Soc. , 125 : 685
- Benayadi , S. 1998 . “ Characterization of quadratic Lie algebras with nilpotent casimir operators ” . In Algebras, Groups and Geometries to appear
- Medina , A. and Revoy , Ph. 1985 . Algebres de Lie et produit scalarie invariant . Ann. Sci. Ecl. Norm. Sup. , 18, 533 : 553 – 561 .
- Favre , G. and Santhroubane , L. J. 1987 . Symmetric, Invariant, Non-degenerate Bilinear Form on a Lie Algebra . J. Algebra , 105 : 451 – 464 .
- Meng , D. J. 1994 . Some results on complete Lie algebras . Comm. Algebras , 22 : 5457 – 5507 .
- Jacobson , N. 1962 . Lie algebra New York : Wiley Interscience .
- Bajo , I. and Benayadi , S. 1997 . Lie algebras admitting a unique quadratic structure . Comm. Alg. , 25 : 2795 – 2805 .
- Kac , V. G. 1990 . Infinite dimensional Lie algebras , 3rd. Cambridge : Cambridge University Press .
- Zhu , L. S. and Meng , D. J. 1999 . The Dimension of the space of invariant symmetric bilinear forms on a quadratic Lie algebra, Preprint
- Zhu , L. S. and Meng , D. J. 1999 . A class of symmetric self-dual Lie algebras, Prepint
- Melville , D. J. 1992 . Centroids of nilpotent Lie algebras . Comm. Alg. , 20 : 3649 – 3682 .
- Yan , Zhi-Da . 1998 . Real semisimple Lie algebras Nankai University Press . in chinese