Gurova, Maria, Nadezhda Kecheva, Polina Andreeva, Elitsa Stefanova, Vladislav Todorov, and Denitsa Sandeva. “Multidisciplinary Research on Flint Raw Materials and Artefacts from Northwestern Bulgaria”. Bulgarian e-Journal of Archaeology | Българско е-Списание за Археология 11, no. 2 (December 20, 2021): 231-267. Accessed January 18, 2022. https://be-ja.org/index.php/journal/article/view/256.