Boyanov, Petar. “Content of Vol. 6, 2014, Journal Scientific and Applied Research: Content of Vol. 6, 2014, Journal Scientific and Applied Research”. JOURNAL SCIENTIFIC AND APPLIED RESEARCH 6, no. 1 (March 9, 2023): 3–4. Accessed November 7, 2024. https://jsar.ftn.shu.bg/index.php/jsar/article/view/133.