Thi Tuan Anh, Tran. “Applying Approximate Entropy to Compare the Randomness of Data Series in Aseans’stock Markets”. Science & Technology Development Journal: Economics- Law & Management 2, no. 4 (March 28, 2019): 5-13. Accessed April 25, 2024. http://stdjelm.scienceandtechnology.com.vn/index.php/stdjelm/article/view/525.