<https://secure.gravatar.com/avatar/078b81d73fdebb17243733547b38bea6?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://lernen-mit-spass.ch/blog/wie-man-mit-stress-waehrend-der-pruefungen-umgeht/>