Kumar, Ajeet, V.V. Prasad, K.C. Raju, Rajdeep Sarkar, P. Ghosal, and A.R. James. “Effect of Lanthanum Substitution on the Structural, Dielectric, Ferroelectric and Piezoelectric Properties of Mechanically Activated PZt Electroceramics”. Defence Science Journal 66, no. 4 (June 28, 2016): 360-367. Accessed August 13, 2020. https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/10209.