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ADDRESS OF THE AUTHORS
1. Assoc. Prof. Dr. Emilia Tcherkezova National Institute of Geophysics, Geodesy and Geography Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 3, Sofia 1113, Bulgaria e-mail: eti2015 @ abv. bg
2. PhD Student Kalin Markov National Institute of Geophysics, Geodesy and Geography Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 3, Sofia 1113, Bulgaria e-mail: kalin. markov @ gmail. com
3. Assoc. Prof. Dr. Marian Varbanov National Institute of Geophysics, Geodesy and Geography Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 3, Sofia 1113, Bulgaria e-mail: marian. varbanov @ gmail. com
4. Assistant Prof. Dr. Stefan Genchev National Institute of Geophysics, Geodesy and Geography Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 3, Sofia 1113, Bulgaria e-mail: st. genchev85 @ abv. bg.
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