The kissing number of the regular polygon. - Likuan Zhao (Discret. Math., 1998)

Two-level Optimization Method for Optimal Control of a Class of Hybrid Systems. - Jihui Zhang 004; Wook Hyun Kwon; Likuan Zhao (ICRA, 2001)

Scheduling and Optimization for a Class of Single-stage Hybrid manufacturing Systems. - Jihui Zhang 004; Wook Hyun Kwon; Likuan Zhao (ICRA, 2001)

The kissing number of the regular pentagon. - Likuan Zhao; Junqin Xu (Discret. Math., 2002)