Shabir Ahmad; Ayesha; Shandana Bibi; Farhan Zahoor; Hazrat Huzaifa. FIRST-PRINCIPLES INVESTIGATION OF THE STRUCTURAL, ELECTRONIC, MECHANICAL, AND OPTICAL PROPERTIES OF HYPOTHETICAL Cs2BeInX6 (X = Cl AND I) DOUBLE PEROVSKITES. SES 2026, 4, 6408-6420.