The process of crack propagation during rotary percussion drilling of hard rocks. Periodicals of Engineering and Natural Sciences, [S. l.], v. 9, n. 4, p. 392–416, 2021. DOI: 10.21533/pen.v9.i4.953. Disponível em: https://pen.ius.edu.ba/index.php/pen/article/view/953. Acesso em: 18 apr. 2026.