@article {simidat235, title = {A Genetic Tuning to Improve the Performance of Fuzzy Rule-Based Classification Systems with Interval-Valued Fuzzy Sets: Degree of Ignorance and Lateral Position}, journal = {International Journal of Approximate Reasoning}, volume = {52}, number = {6}, year = {2011}, pages = {751-766}, doi = {10.1016/j.ijar.2011.0}, author = {J. Sanz and A. Fern{\'a}ndez and H. Bustince and F. Herrera} }