A. Agogino, K. Tumer, and R. Miikkulainen. GECCO'05: Proc. 7th Genetic and Evolutionary Computation Conf., page 1309--1316. Washington, DC, ACM Press, (2005)
M. Akbarzadeh-T., E. Tunstel, K. Kumbla, and M. Jamshidi. Proceedings of the 1998 IEEE World Congress on
Computational Intelligence, 2, page 1200--1205. Anchorage, Alaska, USA, IEEE Press, (5-9 May 1998)
J. Baldwin, T. Martin, and J. Shanahan. Fuzzy Logic in Artificial Intelligence, IJCAI'97
Workshop, Selected and Invited Papers, volume 1566 of Lecture Notes in Artificial Intelligence, page 91--116. Nagoya, Japan, Springer, (August 1997)Published 1999.