Safiullin, Marat Rashitovich, Leonid Alekseevich Elshin, and Elvira Gumarovna Nikiforova. “Methodological Approaches to the Diagnosis and Forecast of the Long-Wave Fluctuations in the Economy”. International Journal of Economics and Financial Issues 6, no. 4 (October 21, 2016): 1616–1624. Accessed May 3, 2024. https://econjournals.com/index.php/ijefi/article/view/3028.