C. Kusumawardani, J. Ikhsan, K. S. Budiasih, Herlambang Nugroho, and A. Widowati, “The Synthesis of CH₃NH₃PbI₃₋ₓBrₓ under Uncontrolled Humidity for Perovskite Solar Cell Application”, sci. technol. indones., vol. 11, no. 1, pp. 298–310, Jan. 2026.