Velinov, Emil, and Stefan Gueldenberg. “The Missing Dimension of Knowledge Transfer from Subsidiaries to Headquarters: The Case of Oil and Gas Companies in CEE Region”. Journal of Eastern European and Central Asian Research (JEECAR) 3, no. 2 (December 26, 2016): 7. Accessed May 4, 2024. https://www.ieeca.org/journal/index.php/JEECAR/article/view/140.