A systolic algorithm for extracting regions from a planar graph. - Zen-Chung Shih; Richard C. T. Lee; S. N. Yang (Comput. Vis. Graph. Image Process., 1989)

A parallel algorithm for finding congruent regions. - Zen-Cheung Shih; Richard C. T. Lee; S. N. Yang (Parallel Comput., 1990)