Sheikhshoaie, Iran. “Preparation, Characterization, Electronic Structures and Non-Linear Optical Properties of Some Asymmetrical Schiff Base Compounds As Model Compounds for Non-Linear Optical Organic Materials”. Asian Journal of Chemistry, vol. 17, no. 3, May 2016, pp. 1827-32, https://asianpubs.org/index.php/ajchem/article/view/14046.