Childe 1929: V. G. Childe. The Danube in Prehistory. Oxford, 1929.
Georgiev 1965: G. I. Georgiev. The Azmak Mound in Southern Bulgaria. - Antiquity, 39, 153, 1965, 6-8.
Velkov 1952: I. Velkov. Der Fels im Kultus der Thraker. - In: Festschrift Rudolf Egger, 1. Klagenfurt, 1952, 28-36.
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