OLLIER, Cliff D. Breccia-filled pipes: distinguishing between volcanic and non-volcanic origins. Geografia Fisica e Dinamica Quaternaria, [S. l.], v. 30, n. 1, p. 63–76, 2007. Disponível em: https://www.gfdq.glaciologia.it/index.php/GFDQ/article/view/343.. Acesso em: 5 apr. 2025.