Tomaz Kralj Ivan Rozman Marjan Hericko Ales Zivkovic Improved standard FPA method--resolving problems with upper boundaries in the rating complexity process. 81-90 2005 77 Journal of Systems and Software 2 http://dx.doi.org/10.1016/j.jss.2004.12.012 db/journals/jss/jss77.html#KraljRHZ05