P-Selectivity: Intersections and Indices. - Lane A. Hemaspaandra; Zhigen Jiang (Theor. Comput. Sci., 1995)

The Join Can Lower Complexity. - Lane A. Hemaspaandra; Zhigen Jiang; Jörg Rothe; Osamu Watanabe 001 (COCOON, 1996)

Logspace Reducibility: Models and Equivalences. - Lane A. Hemaspaandra; Zhigen Jiang (Int. J. Found. Comput. Sci., 1997)

Rotations of Periodic Strings and Short Superstrings. - Dany Breslauer; Tao Jiang 001; Zhigen Jiang (J. Algorithms, 1997)

Polynomial-Time Multi-Selectivity. - Lane A. Hemaspaandra; Zhigen Jiang; Jörg Rothe; Osamu Watanabe 001 (J. Univers. Comput. Sci., 1997)

Boolean Operations, Joins, and the Extended Low Hierarchy. - Lane A. Hemaspaandra; Zhigen Jiang; Jörg Rothe; Osamu Watanabe 001 (Theor. Comput. Sci., 1998)