Ahmed Wazzan, Nuha. “DFT and MP2 Study of Geometry, IR and UV-Visible Spectroscopy and First Hyperpolarizability of 2-Aminopyridine, 3-Aminopyridine and 4-Aminopyridine in Gas Phase and in Solvents”. Asian Journal of Chemistry, vol. 27, no. 12, Aug. 2015, pp. 4641-56, doi:10.14233/ajchem.2015.19304.