M. Yahya, O., عمر, A. Ahmed, B., بیداء, Thanoon, I. and عماد (2013) “Ultrasound-assisted one-pot synthesis of dihydropyrimid-2-one/thiones catalyzed by zirconyl chloride hexahydrate”, Journal of Education and Science (JES), 26(5), pp. 154–159. doi: 10.33899/edusj.2013.163065.