@ARTICLE(Vil01a,
 author = "O. Cord\'on and F. Herrera and L. Magdalena and P. Villar",
 title = "A Genetic Learning Process for the Scaling Factors, Granularity and Contexts of the Fuzzy Rule-Based System Data Base",
 journal = "Information Science",
 year = "2001",
 volume = "136",
 pages = "85-107"
)

@ARTICLE(Vil01b,
 author = "O. Cord\'on and F. Herrera and P. Villar",
 title = "Generating the Knowledge Base of a Fuzzy Rule-Based System by the Genetic Learning of Data Base",
 journal = "{IEEE} Transactions on Fuzzy Systems",
 year = "2001",
 volume = "9",
 number = "4",
 pages = "667-674"
)