Dongcai Shen, Tian Liu. The Fooling Set Problem for Unary Regular Language Is in NP. In Jun Ma, Yilong Yin, Jian Yu, Shuigeng Zhou, editors, Fifth International Conference on Fuzzy Systems and Knowledge Discovery, FSKD 2008, 18-20 October 2008, Jinan, Shandong, China, Proceedings, Volume 3. pages 23-27, IEEE Computer Society, 2008. [doi]
Abstract is missing.