Stanev, Alexander. “Фрагмент от източната крепостна стена на Сердика II: Fragment of the Eastern Fortification Wall of Serdica II”. Bulgarian e-Journal of Archaeology | Българско е-Списание за Археология 6, no. 1 (June 6, 2016): 81–90. Accessed July 3, 2022. https://be-ja.org/index.php/journal/article/view/be-ja-6-1-2016-81-90.