Ivanova, Yordanka, Silviya Georgieva, Kostadin Kolarov, and Krasimira Shindarova. 2021. “Entrepreneurs’ Characteristics As Determinants of the Internationalization of Bulgarian Small and Medium-Sized Enterprises”. UNWE Yearbook, no. 2 (March): 9-27. https://bjiep.e-dnrs.org/index.php/yb/article/view/5926.