Al–Thib, A., & Al–Zaidi, T. (2024). Physical–Spectroscopic Study of Charge-Transfer Complexes of Some Purine Derivatives with (π) and (σ) Electron Acceptors. Iraqi Journal of Science, 54(4. Appendix), 994-1002. https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/12410