@article{JOLT_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},
     zbl = {1100.17003},
     url = {http://geodesic.mathdoc.fr/item/JOLT_2005_15_1_a10/}
}