Politis, Dimitrios Z., Stelios M. Potirakis, Yiannis Contoyiannis, Ilyas Potamitis, Sudipta Sasmal, Shih-Sian Yang, and Masashi Hayakawa. “Lower-Ionosphere Anomalies Prior to Strong Earthquakes That Occurred in North-Central Mainland Greece on March 2021 As Revealed by Multi-Method Analysis of VLF Sub-Ionospheric Propagation Data”. Annals of Geophysics 66, no. 6 (December 31, 2023): SE645. Accessed May 16, 2024. https://www.annalsofgeophysics.eu/index.php/annals/article/view/8986.