Line Graph of Gamma-Acyclic Database Schems and its Recognition Algorithm. - Yun-zhou Zhu (VLDB, 1984)

A New Distributed Breadth-First-Search Algorithm. - Yun-zhou Zhu; To-Yat Cheung (Inf. Process. Lett., 1987)

Recognizing Different Types of Beta-Cycles in a Database Scheme. - To-Yat Cheung; Yun-zhou Zhu (Theor. Comput. Sci., 1991)