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2024. Preparation and Study of the Optical Properties of Recycled Materials of Polymethyl methacryalate Doped with Different Ratios of 4-(2- Pyridylazo) Resorcinol Monosodium Salt Hydrate. Baghdad Science Journal. 21, 12 (Dec. 2024), 3846–3856. DOI:https://doi.org/10.21123/bsj.2024.7953.