CSG-EESI: A New Solid Representation Scheme and a Conversion Expert System. - Shun-En Xie; Thomas W. Calvert (IEEE Trans. Pattern Anal. Mach. Intell., 1988)

PRED: A Frame-Based Primitive Editor. - Shun-En Xie; David F. Dumaresq; Philip H. Winne (Int. J. Man Mach. Stud., 1990)