Boateng , Ebenezer, Emmanuel Asafo-Adjei, John Gartchie Gatsi, Ştefan Cristian Gherghina, and Liliana Nicoleta Simionescu. “Multifrequency-Based Non-Linear Approach to Analyzing Implied Volatility Transmission across Global Financial Markets”. Oeconomia Copernicana 13, no. 3 (September 25, 2022): 699–743. Accessed October 6, 2024. https://journals.economic-research.pl/oc/article/view/2077.