Velkov, V., Lisicov, S. An early Byzantine and mediaeval fort in the Haemus with an inscription and grafitti of emperor Anastasius. София: БАН, 1994 с. 254-265,.
Velkov, V., Lisicov, S. An early Byzantine and mediaeval fort in the Haemus with an inscription and grafitti of emperor Anastasius. София: БАН, 1994 с. 254-265,.
Velkov, V., Lisicov, S. (1994) An early Byzantine and mediaeval fort in the Haemus with an inscription and grafitti of emperor Anastasius, София: БАН с. 254-265,.
Velkov, V., & Lisicov, S. (1994). An early Byzantine and mediaeval fort in the Haemus with an inscription and grafitti of emperor Anastasius. София: БАН, с. 254-265.
Velkov V, Lisicov S. An early Byzantine and mediaeval fort in the Haemus with an inscription and grafitti of emperor Anastasius. София: БАН; 1994. p. с. 254-265.
