1. Baron, G. & Ungemach, P. European geothermal drilling experience-problem areas and case studies. In: International geothermal drilling and completions technology conference. Albuquerque, NM, USA. p. 24 (1981).
2. Batini, F. et al. San Pompeo 2 deep well: a high temperature and high pressure geothermal system. In: Strub, A., Ungemach, P., editors. European geothermal update: Proceedings of the 3rd international seminar on the results of EC geothermal energy research, pp. 341–353 (1983).
3. Ruggieri, G. & Gianelli, G. Fluid inclusion data from the Carboli 11 well, Larderello geothermal field, Italy. In: World Geothermal Congress, Italy; pp. 1087–1091 (1995).
4. Friðleifsson, G. O., Elders, W. A. & Albertsson, A. The concept of the Iceland Deep Drilling project. Geothermics 49, 2–8 (2014).
5. Friðleifsson, G. O. & Elders, W. A. The Iceland Deep Drilling project geothermal well at Reykjanes successfully reaches its supercritical target. Geotherm. Resour. Counc. Bull. 46, 30–33 (2017).