1. United States law as it affects geothermal development;Aidlin,1975
2. Present Status and Future Prospects For Non-electrical Uses of Geothermal Resources;Alcaraz,1975
3. Present Status and Future Prospects for Non-electrical Uses of Geothermal Resources;Alcaraz,1975
4. International Institute for Geothermal Research;Barbier,1983
5. Energy: industrial competition and technological development;Colombo;ENEA News Bulletin,1983