An improved approximation algorithm for the ATSP with parameterized triangle inequality. - Tongquan Zhang; Weidong Li 002; Jianping Li 007 (J. Algorithms, 2009)

The subdivision-constrained minimum spanning tree problem. - Jianping Li 007; Weidong Li 002; Tongquan Zhang; Zhongxu Zhang (Theor. Comput. Sci., 2009)

An improved approximation algorithm for the maximum TSP. - Tongquan Zhang; Ying Yin; Jianping Li 007 (Theor. Comput. Sci., 2010)

Two Approximation Schemes for Scheduling on Parallel Machines under a grade of Service Provision. - Weidong Li 002; Jianping Li 007; Tongquan Zhang (Asia Pac. J. Oper. Res., 2012)

The minimum spanning tree problem with non-terminal set. - Tongquan Zhang; Ying Yin (Inf. Process. Lett., 2012)

Shortest path problems with left-side time windows. - Tongquan Zhang; Ying Yin; Jianping Li 007 (Optim. Lett., 2012)