1. Regarding a global methodology to estimate the energy–ecologic efficiency of thermopower plants
2. Regarding the energy ecologic efficiency of desulphurization and denox systems and installations in thermopower plants
3. Ionel I, Ungureanu C. Thermoenergetics and environment, Editura Tehnică, Bucureşti, 1996 [in Romanian]
4. Matei L, Matei M. Energy sustainable development, Regional Energy Forum FOREN, September 10–14, 2000, Neptun-Olimp, Romania
5. Pruschek R. Improvements of economics and efficiency for IGCC (Joule Project), EU Seminar, 05/06-11-1998, Dűsseldorf, Germany