@conference {Michail_Gr._Vrachopoulos_104980923,
	title = {Definition of horizontal geothermal heat exchanger behaviour},
	booktitle = {9th National Conference on Renewable Energy Sources, (organised by Institute of Solar Technology), Pafos-Geroskipou},
	year = {2009},
	author = {Michail Gr. Vrachopoulos}
}
