Contadakis, M. E., D. Arabelos, and E. Scordilis. “Lower Ionospheric Turbulence Variations During the Recent Activity of Etna’s Volcano, Sicily, in December 2018”. Bulletin of the Geological Society of Greece, vol. 55, no. 1, Aug. 2019, pp. 19-33, doi:10.12681/bgsg.20517.