T. Le, M. Nguyen, and A. Shimazu. Australasian Conference on Artificial Intelligence, volume 9992 of Lecture Notes in Computer Science, page 665-671. Springer, (2016)
M. Nguyen, A. Shimazu, and X. Phan. Australian Conference on Artificial Intelligence, volume 3809 of Lecture Notes in Computer Science, page 800-804. Springer, (2005)