Mohammed إيمان سلام. 2016. “SUBJECT INDEX (Volume 19 – 2015): Subject Index of Research Papers Published in the ‘University of Aden Journal of Natural & Applied Sciences’, and Their Authors Volume 19 (April- August 2015)”. University of Aden Journal of Natural and Applied Sciences 20 (1):103-9. https://uajnas.adenuniv.com/index.php/uajnas/article/view/318.