Boyanov P. Content of vol. 4, 2013: Content of vol. 4, 2013. JSAR [Internet]. 2023 Mar. 6 [cited 2024 Nov. 21];4(1):3-5. Available from: https://jsar.ftn.shu.bg/ojs-3.3.0-7/index.php/jsar/article/view/74