GurovaМaria, Polina Andreeva, Aleksandar Nikolov, Borislav Barbov, and Maria Kostadinova-Avramova. “Heat Alterations of Flint Artefacts: Archaeological Evidence, Experiments and Analyses”. Bulgarian e-Journal of Archaeology | Българско е-Списание за Археология 10, no. 1 (June 7, 2020): 111-141. Accessed July 11, 2020. https://be-ja.org/index.php/journal/article/view/be-ja-10-1-2020-111-141.