1. IFPUG: International Function Point Users Group. http://www.ifpug.org/. Accessed Nov 2020
2. Albrecht, A.J.: Measuring application development productivity. In: Proceedings of the IBM Applications Development Symposium, p. 83 (1979)
3. Meli, R.: Early and extended function point: a new method for function points estimation. In: IFPUG Fall Conference, 15–19, Arizona 1997
4. Meli, R., Santillo, L.: Function point estimation methods: a comparative overview. In: FESMA 1999 Conference Proceedings, Amsterdam (1999)
5. Rask, R.: Algorithm for counting unadjusted function points from dataflow diagram. Technical report, University of Joensuu (1991)