P. TSOURLOS, G. VARGEMEZIS, G. TSOKAS, K. ALEXANDROU, and P. TZELI, “Geophysical prospection for mapping of the qanat systems: apllication to the qanat system of Agia Paraskevi - Choartiati of Thessaloniki (Ν. Greece)”, geosociety, vol. 34, no. 4, pp. 1385–1391, Jan. 2001.