<https://www.credoweb.bg/publication/9509/prof-g-nachev-reformata-e-zakasnyala-i-tryabva-da-prodalzhi>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.credoweb.bg/publication/9509/prof-g-nachev-reformata-e-zakasnyala-i-tryabva-da-prodalzhi>