“SYNTHESIS AND PHOTOCHEMICAL STUDY OF POLY(VINYL CHLORIDE) - 1,3,4-OXADIAZOLE AND 1,3,4-THIADIAZOLE”. Al-Nahrain Journal of Science, vol. 10, no. 1, June 2007, pp. 7-12, https://anjs.edu.iq/index.php/anjs/article/view/1484.