<https://forbot.pl/forum/topic/3473-ciekawe-filmy-elektronika-mechanika-robotyka/page/22/#comment-120908>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://forbot.pl/forum/topic/3473-ciekawe-filmy-elektronika-mechanika-robotyka/page/22/?tab=comments>