Ahmedova, Sibel, Siyka Demirova, Eredzep Musov, and Soner Aziz. ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA 5, no. 1 (June 9, 2021): 13-18. Accessed January 28, 2022. https://aj-tuv.org/index.php/ajtuv/article/view/222.