L. T. . Vu, A. V. . Nguyen, Q. N. . Dao, H. M. . Do, and H. T. T. . Doan, “An Integrated Approach with Permutation Entropy Measure and Conventional Tests for Study on Stock Market Efficiency”, JoE, vol. 3, no. 8, pp. 1382–1399, Nov. 2024.