@book{13927,
	author = {The united nations symposium on the development and utilization of geothermal resources and Istituto Internazionale per le Ricerche Geotermiche},
	title = {Proceedings of the united nations symposium on the development and utilization of geothermal resources.},
	publisher = {Istituto Ingernazionale per le Ricerche Geothermiche,},
	year = {1970.},
	address = {Pisa :}
}