Peter Goddard / David Olive : "Algebras, Lattices And Strings", pp.57, 58, etc,《Vertex Operators in Mathematics and Physics - Proceedings of a Conference November 10-17,1983》,Publications of MSRI #3, Springer-Verlag 1984 ;
或者在pp. 216, 217, etc, 在 Peter Goddard / David Olive 編的重印本:《Kac-Moody and Virasoro Algebras》, Advanced Series in Mathematical Physics, Vol. 3, World Scientific, ISBN 9971-5-0419-7
J. H. Conway, N.J.A. Sloane, "Lorentzian forms for the Leech lattice", AMS [1][永久失效連結]