Colica, Antonella. “Analysis of the Genesis and Evolution of Calanco Morphology in an Experimental Area of Paiccia (Radicofani, Siena, Italy)”. Geografia Fisica E Dinamica Quaternaria, vol. 23, no. 1, June 2000, pp. 21-32, https://www.gfdq.glaciologia.it/index.php/GFDQ/article/view/458.