@article {simidat5, title = {Linguistic Modeling with Hierarchical Systems of Weighted Linguistic Rules}, journal = {International Journal of Approximate Reasoning}, volume = {32}, number = {2-3}, year = {2003}, pages = {187-215}, author = {R. Alcal{\'a} and J. R. Cano and O. Cord{\'o}n and F. Herrera and P. Villar and I. Zwir} }