Geodesic
Extended Affine Root Systems of Type BC
Journal of Lie theory, Tome 15 (2005) no. 1, pp. 145-181 Cet article a éte moissonné depuis la source Heldermann Verlag

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We classify the BC-type extended affine root systems for nullity ≤ 3, in its most general sense. We show that these abstractly defined root systems are the root systems of a class of Lie algebras which are axiomatically defined and are closely related to the class of extended affine Lie algebras. 
@article{JLT_2005_15_1_JLT_2005_15_1_a10,
     author = {S. Azam and V. Khalili and M. Yousofzadeh},
     title = {Extended {Affine} {Root} {Systems} of {Type} {BC}},
     journal = {Journal of Lie theory},
     pages = {145--181},
     year = {2005},
     volume = {15},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/JLT_2005_15_1_JLT_2005_15_1_a10/}
}
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S. Azam; V. Khalili; M. Yousofzadeh. Extended Affine Root Systems of Type BC. Journal of Lie theory, Tome 15 (2005) no. 1, pp. 145-181. http://geodesic.mathdoc.fr/item/JLT_2005_15_1_JLT_2005_15_1_a10/