Comparison between Fuzzy C-means clustering and Fuzzy Clustering Subtractive in urban air pollution. - José Iván Collazo-Cuevas; Marco Antonio Aceves-Fernández; Efrén Gorrostieta Hurtado; Jesús Carlos Pedraza-Ortega; Artemio Sotomayor-Olmedo; Manuel Delgado-Rosas (CONIELECOMP, 2010)