text: [9] New perspectives on the Varna cemetery (Bulgaria) （頁面存檔備份，存於網際網路檔案館）, By: Higham, Tom; Chapman, John; Slavchev, Vladimir; Gaydarska, Bisserka; Honch, Noah; Yordanov, Yordan; Dimitrova, Branimira; September 1, 2007