Curtis-Tits groups of simply-laced type.

Rieuwert J. Blok Corneliu G. Hoffman Curtis-Tits groups of simply-laced type. 1-32 2017 146 J. Comb. Theory A https://doi.org/10.1016/j.jcta.2016.08.009 db/journals/jct/jcta146.html#BlokH17