Ayyaz, A.; Usman, A.; Mahmood, Q.; Ihsan, A.; ur Raheem, F. First Principles Study of Structral, Electronic, and Optical Proeprties of Lead Free Double Perovskites Rb2LiTlX6 (X = Cl, Br, I) for Optoelectronics Applications. J. Mat. Phy. 2023, 4, 92-101.