1. Q. Tan, T. Luo, T. Wei, J. Liu, L. Lin, and J. Xiong, Undefined 26, 351 (2017).
2. W.C. Wilson, and G.M. Atkinson, IEEE Sens. J. 14, 3745 (2014).
3. Y. Li, Y. Yu, H. San, Y. Wang, and L. An, Appl. Phys. Lett. 103, 163505 (2013).
4. M.A. Fonseca, J.M. English, M. von Arx, and M.G. Allen, Undefined 11, 337 (2002).
5. S. Liu, Sens Actuators Tors 21, 54 (2013).