Tahiri, A., B. Benaid, H. Bouzahir, and N. A. M. Khan. “Testing for the Number of Regimes in Financial Time Series GARCH Volatility”. International Journal of Applied Economics, Finance and Accounting, vol. 9, no. 2, Apr. 2021, pp. 82-94, doi:10.33094/8.2017.2021.92.82.94.