C. D. Ollier, “Breccia-filled pipes: distinguishing between volcanic and non-volcanic origins”, GFDQ, vol. 30, no. 1, pp. 63–76, Jun. 2024, Accessed: Dec. 22, 2024. [Online]. Available: https://www.gfdq.glaciologia.it/index.php/GFDQ/article/view/343