Javier Aroba Páez Juan Jose Cuadrado-Gallego Miguel-Ángel Sicilia Isabel Ramos Elena García Barriocanal Segmented software cost estimation models based on fuzzy clustering. 1944-1950 2008 81 Journal of Systems and Software 11 http://dx.doi.org/10.1016/j.jss.2008.01.016 db/journals/jss/jss81.html#PaezCSRB08