Mahmoud, I., Naoui, kamel and Jemmali, H. (2013) “Study of Speculative Bubbles: The Contribution of Approximate Entropy”, International Journal of Economics and Financial Issues, 3(3), pp. 683–693. Available at: https://www.econjournals.com/index.php/ijefi/article/view/443 (Accessed: 16 April 2024).