<https://secure.gravatar.com/avatar/a2eac1f36ef2feaf0336b270962a0315?s=96&d=mm&r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.danner.cz/spojeni-konstrukcnich-dilu-pomoci-trhacich-nytu/>