“STUDY THE PROPERTIES OF THERMOTROPIC LIQUID CRYSTALS INDUCED BY HYDROGEN BONDING BETWEEN PYRIDYL- HETEROCYCLIC DERIVATIVES AND BENZOIC ACID, 4-HEPTYLOXYBENZOIC ACID OR 4-OCTYLOXYBENZOIC ACID”, ANJS, vol. 13, no. 4, pp. 62–69, Jul. 2018, Accessed: May 10, 2024. [Online]. Available: https://anjs.edu.iq/index.php/anjs/article/view/971