<https://mvr.technology/konferencija-razrabotchikov-google-i-o-2019-naznachena-na-maj/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://mvr.technology/konferencija-razrabotchikov-google-i-o-2019-naznachena-na-maj/>