<https://secure.gravatar.com/avatar/217c3cb0fe550d61370a1f04d5a43de7?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://giaxago.com/dinh-dong-coppha-3-phan-tai-huyen-hoc-mon/>