Karam, Nisreen Hussein, et al. “Synthesis, Characterization and Study of The Liquid Crystalline Behavior of Four and Six Heterocyclic Compounds”. Iraqi Journal of Science, vol. 57, no. 3B, Apr. 2022, pp. 1876-90, https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/6875.