Buttrus, N.H., and W.E. Abbas. “Synthesis and Characterization of Coordination Polymers of N-(3-Hydroxy Phenyl) Maleamic Acid- Formaldehyde Resins With Some BiposvtiveCations”. Journal of Education and Science (JES) 17, no. 2 (June 1, 2005): 1–9. Accessed August 4, 2025. https://rjps.uomosul.edu.iq/index.php/edusj/article/view/17627.