Vargemezis, G., P. Tsourlos, C. Papazachos, and D. Kostopoulos. 2007. “Application of Electrical Resistivity Tomography to the Detection of the Ermakia (Northern Greece) Cavity System”. Bulletin of the Geological Society of Greece 40 (4):2060-69. https://doi.org/10.12681/bgsg.17298.