2022. Synthesis and characterization of ( L- proline ) amino acid with (Mn+2 , Fe+2 , Co+2 , Zn+2 and Cd+2 ). مجلة ديالى للبحوث الانسانية. 1, 42 (2022), 1–10. DOI:https://doi.org/10.57592/djhr.v1i42.712.