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 [Internet]. 2018 Jul. 30 [cited 2024 May 10];13(4):62-9. Available from: https://anjs.edu.iq/index.php/anjs/article/view/971