<https://asep.lib.cas.cz/arl-cav/en/print/?idx=cav_un_epca*0520969>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://asep.lib.cas.cz/arl-cav/en/print/?ppage=&idx=cav_un_epca*0520969&iset=1&disprec=1>