1586 20160222141730.0 SISMOimport-101 Camelbeeck, Thierry 2002 Identification of the surface ruptures caused by the two large earthquakes of April 14 and 18, 1928 in southern Bulgaria Vanneste, Kris Verbeeck, Koen Shanov, Stefan Dimitrov, Dimitar Pashova, Lubka Nikolov, Gabriel Kostov, Konstantin Aardkundige Mededelingen 12 2002 25-28 published in NONREF