W.A. van Wamel and P.E. Zwart (1990) “The structural geology and basin development of the Romagnan-Umbrian zone (Upper Savio- and Upper Bidente Valleys, N. Italy)”, Netherlands Journal of Geosciences, pp. 53-68. Available at: https://njgjournal.nl/index.php/njg/article/view/12852 (Accessed: 4April2026).