@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}
}
