Nonova, Tzvetana, Alexander Strezov, Lyuben Dobrev, and Krasimira Slavova. “Radionuclides and Potentially Toxic Elements in Sediments from the Northern Bulgarian Black Sea Coast”. Proceedings of the Bulgarian Academy of Sciences 76, no. 3 (March 27, 2023): 359–367. Accessed October 27, 2026. https://www.proceedings.bas.bg/index.php/cr/article/view/269.