Masako Sato, Yasuhito Mukouchi, Dao Zheng. Characteristic Sets for Unions of Regular Pattern Languages and Compactness. In Michael M. Richter, Carl H. Smith, Rolf Wiehagen, Thomas Zeugmann, editors, Algorithmic Learning Theory, 9th International Conference, ALT 98, Otzenhausen, Germany, October 8-10, 1998, Proceedings. Volume 1501 of Lecture Notes in Computer Science, pages 220-233, Springer, 1998. [doi]
Abstract is missing.