Ikamari, C., P. Ngare, and P. Weke. “Volatility Extraction in Information Based Asset Pricing Framework Via Non-Linear Filtering”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 47, no. 1, June 2019, pp. 147-62, https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/10051.