1. S.Tibbits , The emergence of “4D printing” , TED Talk (Online), available at https://www.ted.com/talks/skylar_tibbits_the_emergence_of_4d_printing , accessed 2019 August 05
2. F.Momeni and J.Ni , Laws of 4D printing , 2018 , arXiv:1810.10376v1 [physics.app-ph]
3. L.Koch , A.Deiwick and B.Chichkov , Laser-Based Cell Printing, 3D Printing and Biofabrication , Springer International Publishing , Cham , 2018 , pp. 303–329
4. Developments in 4D-printing: a review on current smart materials, technologies, and applications
5. Shape memory polymers: Past, present and future developments