STUDYING THE CONDUCTIVITY OF POLYSTYRENE USING 2-(SUB.)-5- [3-(5-NITRO-FUR-2-YL)-PROPEN-2-YLDIENE]AMINO 1,3,4- THIDIAZOLES AS ADDITIVES BY MEASURING FORBIDDEN ENERGY GAP. (2018). Al-Nahrain Journal of Science, 13(3), 30-35. https://mail.anjs.edu.iq/index.php/anjs/article/view/1029