Fiucci, A.; Gigante, B.; Rossi, C.; Smiraglia, C.; Veggetti, O. The Calderone Glacier (Gran Sasso d’Italia). Determination of Ice Thickness and Bedrock Morphology by Means of Radio-Echo Sounding. Geog. Fis. Dinam. Quat. 1997, 20 (2), 305-308.