1. D. Angluin. Finding common patterns to a set of strings. In Proceedings of the 11th Annual Symposium on Theory of Computing, pp. 130–141, 1979.
2. D. Angluin. Finding common patterns to a set of strings. Journal of Computer and System Sciences, Vol. 21, pp. 46–62, 1980.
3. D. Angluin. Inductive inference of formal languages from positive data. Information and Control, Vol. 45, pp. 117–135, 1980.
4. H. Arimura, T. Shinohara, and S. Otsuki. Polynomial time inference of unions of tree pattern languages. In Proceedings of the Second Workshop on Algorithmic Learning Theory, pp. 105–114, 1991. to appear in IEICE trans. Inf. & Syst, 1992, printed in Japan.
5. K.P. Jantke and H-R. Beick. Combining postulates of naturalness in inductive inference. Elektron. Informationsverarb. Kybern., Vol. 17, pp. 465–484, 1981.