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2. Covering algebras I: Extended affine Lie algebras;Allison;J. Algebra,2002
3. Covering algebras II: Isomorphism of loop algebras;Allison;J. Reine Angew. Math.,2004
4. Group gradings on associative algebras;Bahturin;J. Algebra,2001
5. Y. Billig, M. Lau, Irreducible modules for extended affine Lie algebras, in preparation