Demirova, Siyka Dimitrova, and Sibel Ilhanova Ahmedova. “Opportunities to Increase Innovation Activity in Small and Medium-Sized Industrial Enterprises”. ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA 1, no. 1 (December 28, 2017): 45–51. Accessed October 2, 2025. https://aj.tu-varna.bg/index.php/ajtuv/article/view/39.