Mohamed م. إ. س. (2017). SUBJECT INDEX (Volume 20 – 2016): Subject index of research papers published in the "University of Aden Journal of Natural & Applied Sciences", and their authors Volume 24 (April- October 2020). University of Aden Journal of Natural and Applied Sciences, 21(1), 103–109 & 199. Retrieved from https://uajnas.adenuniv.com/index.php/uajnas/article/view/235