@conference {aja2004hierarchical, title = {Hierarchical fuzzy systems with FITM}, booktitle = {Fuzzy Systems, 2004. Proceedings. 2004 IEEE International Conference on}, volume = {2}, year = {2004}, pages = {767{\textendash}772}, publisher = {IEEE}, organization = {IEEE}, author = {Santiago Aja-Fern{\'a}ndez and Carlos Alberola-Lopez} }