<https://e.trudipravo.bg/sobstvenost-i-pravo/industrialna-sobstvenost/upalnomosthavane-i-forma-na-voleizyavleniya-kasaesthi-patentnoto-vedomstvo/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://e.trudipravo.bg/tag/sobstvenost-i-pravo-2021-08/page/2/>