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Rifai, M. , Mujamilah, M., Insani, A. , Muslih, M.R. , Priyanto, T.H. , Sumirat, I. , Bharoto, B., Sulungbudi, G.T. , Prasetya, A.D. , Ridwan, R., Saparudin, M. , Noor H., D. , Sairun, S., Apriansyah, R. and Lubis, W.Z. 2026. Exploring the Impact of Deformation on Strain Energy of Ultrafine-Grained Copper through Equal Channel Angular Pressing: Insights from X-Ray and Neutron Diffraction. Journal of Mathematical and Fundamental Sciences. 57, 3 (May 2026), 221-236. DOI:https://doi.org/10.5614/j.math.fund.sci.2026.57.3.4.