<https://drhussein.net/%d8%a8%d8%af%d8%a7%d8%a6%d9%84-pdf-drive-%d9%84%d8%aa%d8%ad%d9%85%d9%8a%d9%84-%d8%a7%d9%84%d9%83%d8%aa%d8%a8-%d9%88%d8%b3%d8%a7%d9%8a-%d9%87%d8%a8-sci-hub-%d9%84%d8%aa%d8%ad%d9%85%d9%8a%d9%84-%d8%a7/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://drhussein.net/category/research/>