1. K. Maxwell, "Software development productivity.," Advances in Computers, vol. 58, 2003, pp. 1--46.
2. A. Pyster, "Software development productivity," Proceedings of the ACM'82 conference, ACM, 1982, p. 94.
3. S. Wagner and M. Ruhe, "A systematic review of productivity factors in software development," arXiv preprint arXiv:1801.06475, 2018.
4. S. Tangen, "Understanding the concept of productivity," Proceedings of the 7th Asia-Pacific Industrial Engineering and Management Systems Conference, Taipei, 2002, pp. 18--20.
5. J.K. Navlakha, "Software productivity and its management," afips, IEEE, 1899, p. 501.