https://www.academia.edu/32481181/Conjugacy_classes_of_involutive_automorphisms_of_the_C_ell_1_affine_Kac_Moody_algebras
The conjugacy classes of the involutive automorphisms of the affine Kac-Moody algebras \Cli\ for $\ell\geq 2$ are determined using the matrix formulation of...
conjugacy classespdfinvolutiveautomorphismsell