Khosravimanesh, S. ., M. . Cheraghi Seifabad, R. Mikaeil, and R. . Bagherpour. “Experimental Study of the Effect of cooling/Lubricating Fluids on Penetration Rate in Hard and Soft Rock Drilling Process”. Rudarsko-geološko-Naftni Zbornik, vol. 36, no. 5, Nov. 2021, doi:10.17794/rgn.2021.5.8.