"ENERGIA GEOTERMALA" (in Romanian). Asociatia Generala a Inginerilor din Romania. 2009-03-16. Archived from the original on 2009-02-16. Retrieved 2009-03-16.
"ENERGIA GEOTERMALA" (in Romanian). Asociatia Generala a Inginerilor din Romania. 2009-03-16. Archived from the original on 2009-02-16. Retrieved 2009-03-16.