Jesús S. Aguilar-Ruiz José Cristóbal Riquelme Santos Miguel Toro A Tool to Obtain a Hierarchical Qualitative Rules form Quantitative Data. 336-346 1998 conf/ieaaie/1998-1 IEA/AIE (Vol. 1) db/conf/ieaaie/ieaaie1998-1.html#AgilarRT98 https://doi.org/10.1007/3-540-64582-9_764