Litvinenko, Inna L., Anastasiya S. Kaminskaya, Victoria V. Prokhorova, Elena O. Belova, Fedor V. Shutilov, and Elena B. Sheludko. 2016. “The Economic Space in the Region: The Theoretical Approaches to the Study”. International Review of Management and Marketing 6 (1S):119-24. https://econjournals.com./index.php/irmm/article/view/1887.