@book{13018,
	author = {United Nations symposium on the development and utilization of geothermal resources and Istituto per le Ricerche Geotermiche},
	title = {Proceedings of the United Nations symposium on the Development and Utilization of Geothermal Resources.},
	publisher = {Istituto internazionale per le ricerche geotermiche,},
	year = {1970.},
	address = {Pisa :}
}