Alyar, Hamit, and Mehmet Bahat. “Torsional Energy and Nonlinear Optical Properties of 2-, 3-R-4-Phenylpyridine (R = CH3, NH2 and NO2)”. Asian Journal of Chemistry 24, no. 11 (June 30, 2012): 5319–5323. Accessed June 26, 2024. https://asianpubs.org/index.php/ajchem/article/view/9846.