Merabet, M., Bouchama, I., Chihi, T., Foudia, L., Saidi, F. and Bouarissa, N. 2025. Ab Initio Study of the Effect of Sulphur Concentration on the Structural, Electronic and Optical Properties of CuIn(Se1-xSx)2 Compound using Generalized Gradient Approximation. Engineering, Technology & Applied Science Research. 15, 3 (Jun. 2025), 24026–24034. DOI:https://doi.org/10.48084/etasr.10785.