Possible nature of seismic activity of Cisdobrogea sag and North Dobrogea depths - V. I. Starostenko; T. K. Burakhovich; A. N. Kushnir; O. V. Aegostaeva; T. A. Tsvetkova; E. M. Sheremet; A. A. Shumljanskaja (Geophysical journal, 2013)