Kumar, Praveen, and S.D. Sharma. “Electronic Absorption Spectra of 2-Amino-3,5-Dichloro-2,6-Difluoro-Pyridine and 2-Hydroxy-5-Nitro Pyridine ”. Asian Journal of Chemistry, vol. 8, no. 4, Mar. 2010, pp. 792-8, https://asianpubs.org/index.php/ajchem/article/view/24193.