VILLENEUVE, M. C.; HEAP, M. J. Calculating the cohesion and internal friction angle of volcanic rocks and rock masses. Volcanica, [S. l.], v. 4, n. 2, p. 279–293, 2021. DOI: 10.30909/vol.04.02.279293. Disponível em: https://jvolcanica.org/ojs/index.php/volcanica/article/view/134. Acesso em: 3 feb. 2025.