Growth and characterization of bis(hydrogenmaleate)-Cu(II) tetrahydrate single crystals: A new metal–organic third-order nonlinear optical material. - Mol, Y. K. Pratheesha; Vinu, S.; Gopakumar, S. Keerthi; Sindhusha, S.; Christy, R. Sheela; Vinitha, G. (Journal of Materials Science: Materials in Electronics, 2025)