<https://drhussein.net/%d8%af%d9%83%d8%aa%d9%88%d8%b1-%d8%ad%d8%b3%d9%8a%d9%86-%d8%b9%d8%a8%d8%af-%d8%a7%d9%84%d9%81%d8%aa%d8%a7%d8%ad-%d9%8a%d8%aa%d9%84%d9%82%d9%89-%d8%af%d8%b9%d9%88%d8%a9-%d9%84%d8%b9%d8%b6%d9%88%d9%8a/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://drhussein.net/category/research/>