New Frontiers in Artificial Intelligence : JSAI 2003 and JSAI 2004 Conferences and Workshops, Niigata, Japan, June 23-27, 2003, Kanazawa, Japan, May 31-June 4, 2004, Revised Selected Papers - Sakurai, Akito (Herausgeber); Hasida, Koiti (Herausgeber); Nitta, Katsumi (Herausgeber) (Lecture Notes in Artificial Intelligence, 2007)