Programmed grammars with multi-production core and their applications (abstract). - Edward T. Lee; Shangyong Zhu (ACM Conference on Computer Science, 1988)

Generating Rectangles using Two-Dimensional Grammars with Time and Space Complexity Analyses. - Edward T. Lee; Shangyong Zhu; Peng-Ching Chu (Int. J. Pattern Recognit. Artif. Intell., 1989)

Generating Rectangles using Two-Dimensional Grammars with Time and Space Complexity analyses. - Edward T. Lee; Shangyong Zhu; Peng-Ching Chu (Array Grammars, Patterns and Recognizers, 1989)