Investigation of the Pineios Delta (Thessaly) shallow aquifer development, combining geophysical and hydrogeological data - Alexopoulos, J.; Matiatos, I.; Dilalos, S.; Vassilakis, E; Panagopoulos, A; Ghionis, G.; Poulos, S. (10th Congress of the Hellenic Intern. Geographical Society, 2014)