Ali Umar Ahmad, Suraya Ismail, Siba Dayyabu, Ahmad Azrin Adnan, Ibrahim Sambo Farouq, and Aminu Hassan Jakada. 2020. “Non-Linear Causal Link Between Central Bank Intervention and Exchange Rate Volatility in Nigeria”. Global Journal of Management and Business Research 20 (B6):17-29. https://journalofbusiness.org/index.php/GJMBR/article/view/3138.