Experimental study of the effect of cooling/lubricating fluids on penetration rate in hard and soft rock drilling process . Rudarsko-geološko-naftni zbornik, [S. l.], v. 36, n. 5, 2021. DOI: 10.17794/rgn.2021.5.8. Disponível em: https://ojs.srce.hr/index.php/rgn/article/view/18227. Acesso em: 19 aug. 2025.