Wellmer, F.-W.; Ochmann, N.; Kraml, M. & Franken, G. (2004): Removing barriers in developing countries: GEOTHERM - German Program for Promoting the Utilization of Geothermal Energy - International Conference for Renewable Energies, 1 - 4 June 2004, Bonn, Germany (PDF, 709 KB)
Date of issue: September 14, 2009