Wieczorek, Gerald F. “Directions of the U.S. Geological Survey Landslide Hazards Reduction Program”. Geografia Fisica e Dinamica Quaternaria 16, no. 1 (June 30, 1993): 21–25. Accessed May 24, 2026. https://www.gfdq.glaciologia.it/index.php/GFDQ/article/view/709.