<https://secure.gravatar.com/avatar/5eac5dd4fcd77324507c7da5ea96d374?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://chuyenbian.com/vi-sao-hoang-hon-tren-sao-hoa-co-mau-xanh/>