EHTEMAMI, Negar; AGHELI, Lotf Ali; PEYKARJOU, Kambiz. 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. Business, Marketing, and Finance Open, [S. l.], p. 1–19, 2026. Disponível em: https://www.bmfopen.com/index.php/bmfopen/article/view/421.. Acesso em: 8 jun. 2026.