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Orsi, G.; Civetta L.; de Vita S.; Di Vito M.A.; Isaia R.; Petrazzuoli S.M.; Ricciardi G.P.; Ricco C. (1999). »Short-term ground deformations and seismicity in the resurgent Campi Flegrei caldera (Italy): an example of active block-resurgence in a densely populated area«. Journal of Volcanology and Geothermal Research. Elsevier. 91 (2–4): 415–451. Bibcode:1999JVGR...91..415O. doi:10.1016/S0377-0273(99)00050-5.