Bhaskar, A. K., M. Packirisamy, and R. B. Bhat. “Modeling Electrostatic Field in Mems Devices Using Artdticial Springs in Rayleigh-Ritz Method”. Canadian Acoustics, vol. 37, no. 3, Sept. 2009, pp. 204-5, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2205.