Maina, Francis Irungu, Nahashon Osinde, Japheth Ka’pesha Odira, Patrick Kariuki Wanjiru, and Margaret Wanjiku Mwangi. “4D Printing and Characterization of Shape Memory Polymer (SMP) Based Smart Gripper”. European Journal of Engineering and Technology Research 5, no. 10 (October 9, 2020): 1204-1211. Accessed April 12, 2021. https://ejers.org/index.php/ejers/article/view/2174.