Empirical Assessment of Methods for Software Size Estimation. - Ales Zivkovic; Marjan Hericko; Tomaz Kralj (Informatica (Slovenia), 2003)

Improved standard FPA method–resolving problems with upper boundaries in the rating complexity process. - Tomaz Kralj; Ivan Rozman; Marjan Hericko; Ales Zivkovic (J. Syst. Softw., 2005)