WAGREICH, M.; DOCHEV, D.; PAVLISHINA, P.; KOUKAL, V. Santonian-Campanian Boundary Interval in the Kyunetsa Section, Western Srednogorie Zone, Bulgaria. Proceedings of the Bulgarian Academy of Sciences, Sofia, Bulgaria, v. 75, n. 11, p. 1604–1612, 2022. DOI: 10.7546/CRABS.2022.11.07. Disponível em: https://proceedings.bas.bg/index.php/cr/article/view/197. Acesso em: 4 oct. 2026.