@article{Radulov:1599,
      author        = "Radulov, Alexander and Vanneste, Kris and Verbeeck, Koen
                       and Shanov, Stefan and Camelbeeck, Thierry and Yaneva,
                       Marlena",
      title         = "{Past seismicity of the fault activated during the April
                       18, 1928 earthquake according to data from a trench near
                       Popovitsa, Southern Bulgaria}",
      year          = "2004",
}