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. .; Lubis, W. Z. . Exploring the Impact of Deformation on Strain Energy of Ultrafine-Grained Copper through Equal Channel Angular Pressing: Insights from X-Ray and Neutron Diffraction. J. Math. Fund. Sci. 2026, 57, 221-236.