J. Hernández, E. Sánchez, and D. Suarez. Soft Computing for Hybrid Intelligent Systems, volume 154 of Studies in Computational Intelligence, Springer, (2008)
J. Hernández, E. Sánchez, and D. Suarez. Analysis and Design of Intelligent Systems using Soft Computing Techniques, volume 41 of Advances in Soft Computing, Springer, (2007)