Dhaker, Kedari, and Arun Pandey. “Particle Swarm Optimisation of Hole Quality Characteristics in Laser Trepan Drilling of Inconel 718”. Defence Science Journal 69, no. 1 (January 10, 2019): 37-45. Accessed May 27, 2020. https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/12879.