Armadillo, E., F. Massa, G. Caneva, M. Gambetta, and E. Bozzo. 1998. “Modelling of Karst Structures by Geophysical Methods. An Example: The Doline of S. Pietro Dei Monti (Western Liguria)”. Annals of Geophysics 41 (3). https://doi.org/10.4401/ag-4337.