@article{10_4153_S0008414X20000358,
     author = {Marquis, Timoth\'ee},
     title = {On the structure of {Kac{\textendash}Moody} algebras},
     journal = {Canadian journal of mathematics},
     pages = {1124--1152},
     year = {2021},
     volume = {73},
     number = {4},
     doi = {10.4153/S0008414X20000358},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008414X20000358/}
}