Authors
Ivelina Georgieva
National Institute of Geophysics, Geodesy and Geography – Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria
Georgi Gadzhev
National Institute of Geophysics, Geodesy and Geography – Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria
Kostadin Ganev
National Institute of Geophysics, Geodesy and Geography – Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria
Dimitrios Melas
Aristotle University of Thessaloniki Faculty of Sciences School of Physics, 54124, Thessaloniki, Greece
