@article{JOLT_2002_12_2_a12,
     author = {S. Azam},
     title = {Extended {Affine} {Root} {Systems}},
     journal = {Journal of Lie Theory},
     pages = {515--527},
     year = {2002},
     volume = {12},
     number = {2},
     doi = {10.5802/jolt.278},
     zbl = {1014.17020},
     url = {https://jolt.centre-mersenne.org/articles/10.5802/jolt.278/}
}