Ying Ci, Wee, Muhammad Hafiz Akhbar, and Tuty Asma Abu Bakar. 2019. “Microstructure and Hardness of Copper Based Shape Memory Alloys With Fourth Alloying Elements”. Jurnal Mekanikal 41 (2). https://jurnalmekanikal.utm.my/index.php/jurnalmekanikal/article/view/331.