G. Karagiannis and C. Pantzios
2002, Article (sc. journal)
K. Velentzas and S. Katranidis
2000, Article (sc. journal)
C. Pantzios and S. Rozakis and V. Tzouvelekas
2006, Article (sc. journal)
V. Tzouvelekas and C. Fotopoulos and C. Pantzios
2002, Article (sc. journal)
T. Gemtos
2005, Article (sc. journal)
Commission européenne
2000, Article (sc. journal)