A conformally invariant sphere theorem in four dimensions Sun-Yung A. Chang; Matthew J. Gursky; Paul C. Yang — 2003 Publications Mathématiques de l'IHÉS
Compactness of isospectral conformal metrics on S3. Sun-Yung A. Chang; Paul C. Yang — 1989 Commentarii mathematici Helvetici
Some progress in conformal geometry. Chang, Sun-Yung A.; Qing, Jie; Yang, Paul — 2007 SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]