Gopalan, Poofa, S.S. Sankari, D. Kumar, and R. Nair. “Software Quality Assurance-Challenges in Launch Vehicle Projects”. Defence Science Journal 56, no. 1 (January 1, 2006): 31-38. Accessed August 5, 2020. https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/1865.