Опря, А. Т. “Methodological Support of Economic Forecast (in the Context of Hypothesis of Stability and Regularity Development of Phenomena in the Temporal Space)”. Scientific Progress & Innovations, no. 1 (March 29, 2012): 201–207. Accessed September 16, 2025. https://journals.pdau.edu.ua/visnyk/article/view/538.