@article {simidat87, title = {Subgroup Discovery in Large Size Data Sets Preprocessed Using Stratified Instance Selection for Increasing the Presence of Minority Classes}, journal = {Pattern Recognition Letters}, volume = {29}, year = {2008}, pages = {2156-2164}, doi = {10.1016/j.patrec.2008.08.001}, author = {J. R. Cano and S. Garc{\'\i}a and F. Herrera} }