Rehman, Yaser, and Sadia Alvi. “Effect of Nickel Wire Gauze on Coupling Factor, Conductance and Efficiency of PZT-Steel Unimorphs”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 26, no. 1, Mar. 2016, pp. 249-58, https://www.gssrr.org/JournalOfBasicAndApplied/article/view/5366.