M. A. Hassib, M. R. Islam, M. R. Karim, M. S. Hasan, and K. R. Hossain, “RESEARCH PROGRESS OF 4D PRINTING TECHNOLOGY”, Kufa J. Eng., vol. 15, no. 3, pp. 107–133, Aug. 2024, doi: 10.30572/2018/KJE/150307.