Ciancabilla, N., M. Ditta, F. Italiano, and G. Martinelli. “The Porretta Thermal Springs (Northern Apennines): Seismogenic Structures and Long-Term Geochemical Monitoring”. Annals of Geophysics 50, no. 4 (December 25, 2007): 513–526. Accessed September 23, 2021. https://www.annalsofgeophysics.eu/index.php/annals/article/view/4436.