Revanasiddappa byakod, Dr. H d gopalakrishna, and Skln prasanna. “EFFECT OF THIN FILM COATINGS ON DRILL BIT”. International Journal of Advance Research in Engineering, Science & Technology, vol. 1, no. 1, Dec. 2014, pp. 6-10, https://ijarest.org/index.php/ijarest/article/view/3.