Bairagi, V., M. Rathod, and T. Shirsath. “Automatic Grain Size Detection and Classification of Metals”. Helix - The Scientific Explorer | Peer Reviewed Bimonthly International Journal, vol. 9, no. 03, June 2019, pp. 4899-05, https://helixscientific.pub/index.php/home/article/view/38.