Unluturk, Mehmet Suleyman, and Kaan Kurtel. “Quantifying Productivity of Individual Software Programmers: Practical Approach”. Computing and Informatics 34, no. 4 (February 29, 2016): 959–972. Accessed April 30, 2025. https://www.cai.sk/ojs/index.php/cai/article/view/969.