<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://e.rpp-noticias.io/medium/2016/10/06/463246_260559.png>
<http://rpp.pe/blog/vida/por-que-cada-vez-mas-bebes-nacen-por-cesarea-noticia-1000379?ns_source=organico>