Khosravimanesh, S. ., Cheraghi Seifabad, M. ., Mikaeil, R., & Bagherpour, R. . (2021). Experimental study of the effect of cooling/lubricating fluids on penetration rate in hard and soft rock drilling process . Rudarsko-geološko-Naftni Zbornik, 36(5). https://doi.org/10.17794/rgn.2021.5.8