Weihua He, Ziwen Liu, Chao Yang*. Snowman is PSPACE -complete. Theoretical Computer Science, 2017, 677: 31-40
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上一条： Weihua He, Jun Luo, Wei Yuan, Chao Yang*, Huichun Zhang, Ricci-flat graphs with girth four, Acta Mathematica Sinica, English Series, 2021, 37 (11): 1679-1691. 下一条： Chengfu Qin*, Weihua He, Kiyoshi Ando. A constructive characterization of contraction critical 8-connected graphs with minimum degree 9. Discrete Mathematics, 2019, 342(11): 3047-3056