Ehtemami N, Agheli LA, Peykarjou K. Threshold Effects of Financial Stress on the Relationship Between Oil Price Volatility and the COVID-19 Crisis on Stock Return Volatility in Pharmaceutical Companies Listed on the Tehran Stock Exchange. BMF OPEN. Published online September 1, 2026:1-19. Accessed June 8, 2026. https://www.bmfopen.com/index.php/bmfopen/article/view/421