L. D. Trong, P. D. Long, and N. N. Dinh, “Effect of Annealing Temperature on the Li\(^{ + }\) Ionic Conductivity of La\(_{0.67 - x}\)Li\(_{3x}\)TiO\(_{3 }\)”, Comm. Phys., vol. 19, no. 4, pp. 235–242, Dec. 2009.