Real Zeros of Positive Semidefinite Forms. I. Bruce Reznick; M.-D. Choi; T.-Y. Lam — 1980 Mathematische Zeitschrift
Gauss polynomials and the rotation algebra. M.-D. Choi; G.A. Elliot; N. Yui — 1990 Inventiones mathematicae
Membrane locking in the finite element computation of very thin elastic shells D. Choi; F. J. Palma; E. Sanchez-Palencia; M. A. Vilariño — 1998 ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique