  A Vogan diagram is a Dynkin diagram of a Kac-Moody Lie algebra of finite or
affine type overlayed with additional structures. This paper develops the
theory of Vogan diagrams for almost compact real forms of indecomposable
twisted affine Kac- Moody Lie algebras and shows that equivalence classes of
Vogan diagrams correspond to isomorphism classes of almost compact real forms
of twisted affine Kac-Moody Lie algebras as given by H. Ben Messaoud and G.
Rousseau.

Rings and Algebras