1. D. Kruk and A. Korshun, Economic Cycle and Leading Indicators: Methodological Approaches and Possibilities of Their Use in Belarus, (IPM Research Center, 2010) [in Russian].
2. Yu. A. Aderikho and A. F. Kryukov, Foreign Methods for the Estimation and Forecasting of Economic Cycles to Indicate Social Processes. http://gisap.eu/ru/node/935
3. A. V. Aksyanova, L. A. El’shin, and A. I. Shakirova, “Assessment of Business Activity in a Region with the Use of a Composite Advanced Index,” Bulletin of the Kazan Technological University, no. 8 (2011).
4. S. A. Smirnov, “New System of Cyclical Indicators for Russia,” in Proceeding of the 28th CIRET Conference, Rome (2006).
5. A. A. Khaertdinova, “Evaluation Index of Business Activity in a Region (on the Example of Samara Oblast),” Ekon. Analiz: Teoriya i Praktika, no.22 (2010).