Singh, M., and V. Dubey. “Study of Penetration Depth As a Function of Temperature, in-Plane Hopping and Single Particle Tunneling in Cuprate Superconductors”. International Multidisciplinary Research Journal, vol. 2, no. 1, Jan. 2012, https://updatepublishing.com/journal/index.php/imrj/article/view/1543.