1. Costagliola, G., Tortora, G.: Class points: An approach for the size Estimation of Object-oriented systems. IEEE Transactions on Software Engineering 31(1), 52–74 (2005)
2. Misra, S., Akman, I.: Weighted Class Complexity: A Measure of Complexity for Object Oriented Systems. Journal of Information Science and Engineering 24, 1689–1708 (2008)
3. Chidamber, S.R., Kermer, C.F.: A Metric Suite for object oriented design. IEEE Transacations Software Engineering SE-6, 476–493 (1994)
4. http://www.Python.org/about/success/carmanah/
5. Lutz, M.: Learning Python, 4th edn., Ebook, Safari Books Online, O’Reilly Media, Sebastopol (2009)