بحوث الأستاذ الدكتور إحسان فليح حسن
http://www.ijpronline.com/ViewSpecialArticleDetail.aspx?ID=1257
https://www.sciencedirect.com/science/article/pii/B9780128221341000075?via%3Dihub
https://link.springer.com/referenceworkentry/10.1007%2F978-3-030-11155-7_16-1
https://link.springer.com/referenceworkentry/10.1007%2F978-3-030-10614-0_16-1
http://www.envirobiotechjournals.com/article_abstract.php?aid=9865&iid=281&jid=3
https://link.springer.com/referenceworkentry/10.1007%2F978-3-319-68255-6_29
https://www.cabdirect.org/cabdirect/abstract/20203181564
https://library.parker.edu/eds/detail?db=her&an=138553250
https://link.springer.com/chapter/10.1007%2F978-981-13-1840-5_23
https://link.springer.com/chapter/10.1007%2F978-981-13-1187-1_11
https://integrityresjournals.org/journal/JBBD/article-abstract/CDDFEFEB1
http://www.ijpab.com/vol4-iss2a4.php
https://www.ijcmas.com/vol-4-4/Ihsan%20Flayyih%20Hasan%20AI-Jawhari,%20et%20al.pdf
https://www.cabdirect.org/cabdirect/abstract/20153046220