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Grigorova, E., D. Sokerova, Ludmil Christoskov, and Sn. Rizhikova. \i Catalogue of the Earthquakes in the Territory of Bulgaria for the Period 1900-1977\i0 . Sofia: Bulgarian Acad\'acemy of Sciences, Archives of the Geophysical Institute of BAS, 1979, 1979.\par \par Christoskov, Ludmil, D. Sokerova, and Sn. Rizhikova. \i New Catalogue of the Earthquakes in the Territory of Bulgaria and Adjacent Region for the Period V century BC to XIX century\i0 . Sofia: Bulgarian Academy of Sciences, Archives of the Geophysical Institute of BAS, 1979, 1979.\par \par }