@conference {simidat70, title = {A first study on the use of fuzzy rule based classification systems for problems with imbalanced data sets}, booktitle = {Proceedings of the Symposium on Fuzzy Systems in Computer Science (FSCS)}, year = {2006}, month = {September}, pages = {63-72}, address = {Magdeburg (Germany)}, author = {M. J. del Jesus and A. Fern{\'a}ndez and S. Garc{\'\i}a and F. Herrera} }