A comparative study of nonlinear shape models for digital image processing and pattern recognition. - Zi-Cai Li; Quan Lin Gu; Ching Y. Suen; Tien D. Bui (IEEE Trans. Syst. Man Cybern., 1990)

Harmonic models of shape transformations in digital images and patterns. - Zi-Cai Li; Ching Y. Suen; Tien D. Bui; Quan Lin Gu (CVGIP Graph. Model. Image Process., 1992)

Splitting-Integrating Method for Normalizing Images by Inverse Transformations. - Zi-Cai Li; Ching Y. Suen; Tien Dai Bui; Yuan Yan Tang; Quan Lin Gu (IEEE Trans. Pattern Anal. Mach. Intell., 1992)