Mohamed م. إيمان سلام. “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, no. 1 (April 30, 2017): 103–109 & 199. Accessed May 16, 2024. https://uajnas.adenuniv.com/index.php/uajnas/article/view/235.