https://core.ac.uk/download/pdf/6468450.pdf
https://cs.uwaterloo.ca/~apidduck/se362/Lectures/cocomo.pdf
https://cs.uwaterloo.ca/~apidduck/CS846/Seminars/abbas.pdf
https://files.ifi.uzh.ch/rerg/amadeus/teaching/seminars/seminar_ws0203/Slides_5.pdf