Some generalized Kac-Moody algebras with known root multiplicities /
Niemann, Peter,1965-
American Mathematical Society.
Providence, R.I. : American Mathematical Society,
c2002.
"Volume 157, number 746 (second of 5 numbers)."
Includes bibliographical references (p. 116-117).
Kac-Moody algebras.
Root systems (Algebra)