Klaus P. Jantke Shigenobu Kobayashi Etsuji Tomita Takashi Yokomori Algorithmic Learning Theory, 4th International Workshop, ALT '93, Tokyo, Japan, November 8-10, 1993, Proceedings ALT Lecture Notes in Computer Science 744 Springer 1993 3-540-57370-4 db/conf/alt/alt1993.html