C. M. Lonkar, D. K. Kharat, H. H. Kumar, S. Prasad, and K. Balasubramanian, “Effect of Sintering Time on Dielectric and Piezoelectric Properties of Lanthanum Doped Pb(Ni1/3Sb2/3)-PbZrTiO3 Ferroelectric Ceramics”, Def. Sc. J., vol. 63, no. 4, pp. 418–422, Jul. 2013.