P. R. Federici, “Una ipotesi di cronologia glaciale würmiana, tardo e post-würmiana nell’Appennino Centrale: An hypothesis of Würmian, Late and Post Würmian glacial chronology in the Central Apennines”, Geog. Fis. Dinam. Quat., vol. 2, no. 2, pp. 196–202, Dec. 1979, Accessed: Jul. 15, 2025. [Online]. Available: https://www.gfdq.glaciologia.it/index.php/GFDQ/article/view/1020