1. Queen's Papers in Pure and Applied Mathematics;M.D. Choi,1976
2. Choi, M.D., Lam, T.Y.: Extremal positive semidefinite forms. Math. Ann.231, 1?18 (1977)
3. Choi, M.D., Lam, T.Y., Reznick, B.: A combinatorial theory for sums of squares. In preparation, see Abstracts A.M.S. 783-12-30
4. Choi, M.D., Lam, T.Y., Reznick, B.: Symmetric quartic forms. In preparation, see Abstracts A.M.S. 736-10-21
5. Coxeter, H.M.S.: The Lehmus inequality. Aequationes Math.28, 4?12 (1985)