Kassium, Yacoob Abdulla, and Khlood Abdulla Ahmed Hussein. 2019. “Synthesis and Characterization of Some New Heterocyclic Compounds With Two Heteroatom’s (Nitrogen) in Their Cyclic”. University of Aden Journal of Natural and Applied Sciences 23 (2):355-74. https://doi.org/10.47372/uajnas.2019.n2.a08.