Solovieva, M., Rozhnoi, A., Fedun, V., Schwingenschuh, K., & Hayakawa, M. (2015). Ionospheric perturbations related to the earthquake in Vrancea area on November 22, 2014, as detected by electromagnetic VLF/LF frequency signals. Annals of Geophysics, 58(5), A0552. https://doi.org/10.4401/ag-6827