Ekaette Inyang Enang & Christian Elendu Onwukwe, T. K. . S. “Estimating the Parameters of GARCH Models and Its Extension: Comparison Between Gaussian and Non- Gaussian Innovation Distributions”. Covenant Journal of Physical and Life Sciences, vol. 8, no. 1, June 2020, https://journals.covenantuniversity.edu.ng/index.php/cjpls/article/view/2108.