[MathOuvrage]
Lie algebras graded by the root systems BCr, r>=2
/ Allison, Bruce N. ; Benkart, Georgia ; Gao, Yun.
-Providence RI : American mathematical Society, 2002. - ix, 158 p. ; 26 cm
ISBN 9780821828113
[MathOuvrage]
Extended affine Lie algebras and their root systems
/ Allison, Bruce N. ; Azam, Saeid ; Berman, Stephen ; Gao, Yun ; Pianzola, Arturo.
-Providence RI : American mathematical Society, 1997. - vii, 122 p. ; 26 cm
ISBN 9780821805947