Simeonov, G. The Region of the Danube Delta in the 7th to 10th Century and the Case of the so-Called Lykostomion Maritime Province. In Seasides of Byzantium: Harbours and Anchorages of a Mediterranean Empire; Preiser-Kapeller, J., Kolias, T. G., Daim, F., Hrsg.; Byzanz zwischen Orient und Okzident; Propylaeum: Heidelberg, 2022; S. 233-254. https://doi.org/10.11588/propylaeum.910.c12059.