https://zemetresenie.info/istoria/ https://zemetresenie.info/istoria/zemetresenie-kresna-krupnik-1904/ https://zemetresenie.info/istoria/chirpansko-zemetresenie-1928/ https://zemetresenie.info/istoria/zemetresenie-vrancha-1977/ https://zemetresenie.info/istoria/zemetresenie-strazhitsa-1986/