Stephen A. Fenner, William I. Gasarch. The Complexity of Learning SUBSEQ (::::A::::). In José L. Balcázar, Philip M. Long, Frank Stephan, editors, Algorithmic Learning Theory, 17th International Conference, ALT 2006, Barcelona, Spain, October 7-10, 2006, Proceedings. Volume 4264 of Lecture Notes in Computer Science, pages 109-123, Springer, 2006. [doi]
Abstract is missing.