B. Hu, L. H. Khoi, and T. Le, “Composition operators between Np-spaces in the ball”, NWEJM, no. 2, pp. 111–128, Jul. 2016, Accessed: Nov. 23, 2024. [Online]. Available: https://nwejm.univ-lille.fr/index.php/nwejm/article/view/61