@INPROCEEDINGS{Promitheas1:Conf, AUTHOR = {Stefanos Oikonomou and George Drosatos and Theocharis Papadopoulos and Maria Oikonomou}, TITLE = {Investigate via internet the consumer's willingness to pay for the sake of the environmental protection}, BOOKTITLE = {In proceedings of the 2nd International Scientific Conference on ``Energy and Climate Change'', PROMITHEAS Network}, MONTH = {Oct.}, address = {Athens, Greece}, YEAR = {2009} }