1. Allison B., Azam S., Berman S., Gao Y., Pianzola A.: Extended affine Lie algebras and their root systems. Mem. Am. Math. Soc. 126, 603 (1997)
2. Allison B., Berman S., Faulkner J., Pianzola A.: Realization of graded-simple algebras as loop algebras. Forum Math. 20, 395–432 (2008)
3. Allison, B., Berman, S., Faulkner, J., Pianzola, A.: Multiloop realizations of extended affine Lie algebras and Lie tori arXiv:0709.0975. Trans. Am. Math. Soc. (to appear)
4. Allison B., Berman S., Pianzola A.: Covering algebras II: isomorphism of loop algebras. J. Reine Angew. Math. (Crelle) 571, 39–71 (2004)
5. Allison B., Berman S., Pianzola A.: Iterated loop algebras. Pac. J. Math. 227, 1–41 (2006)