Safiullin, M. R., Elshin, L. A., & Nikiforova, E. G. (2016). Methodological Approaches to the Diagnosis and Forecast of the Long-Wave Fluctuations in the Economy. International Journal of Economics and Financial Issues, 6(4), 1616–1624. Retrieved from https://www.econjournals.com/index.php/ijefi/article/view/3028