M. K. Islam, M. S. Rahman, S. A. Urmi, A. Al Mamun, and J. Uddin, “Study of the Morphological, Electrical and Optical Properties of Ca4SrCu3Ti4O12 Ceramic”, Chem. Eng. Res. Bull., vol. 24, no. 1, pp. 41–46, Jan. 2026.