Vladimirova, K., & Atanasova, M. (2009). Flexible Forms of Employment in Small and Medium-Size Enterprises: Conditions and Opportunities for Development. Kеy findings of research into the application of flexible forms of employment in small and medium-size enterprises in Bulgaria. UNWE Yearbook, 1, 7-46. https://bjiep.e-dnrs.org/index.php/yb/article/view/6040