Irzooqi, Wisam Shareef. “A STUDY OF THE OPTICAL PROPERTIES AND ENERGY GAP TUNING THROUGH NICKEL DOPING IN Z-SCAN AND DIFFUSE REFLECTION TECHNIQUES FOR LA₀.₅SR₁.₅CO₂₋ₓNIₓO₂ COMPOSITE PARTICLES”. International Journal Multidisciplinary (IJMI), vol. 3, no. 4, Sept. 2026, pp. 22-32, doi:10.61796/ijmi.v3i4.617.