Settar, A., Fatmi, N. I., & Badaoui, M. (2020). New Approach in Dealing with the Non-Negativity of the Conditional Variance in the Estimation of GARCH Model. Central European Journal of Economic Modelling and Econometrics, 13(1), 55–74. https://doi.org/10.24425/cejeme.2021.137355