KUJAWA, Tomasz - GHANNOUCHI, Abdelmajid. Ecological evaluation of work of a geothermal heating plant with the heat exchanger co-operating with the peak load boiler. In Acta mechanica Slovaca. - Technická univerzita v Košiciach : Košice. ISSN 1335-2393, 2003, roč. 7, č. 3, s. 165-170.