id	domain	url
cet-15018	www.cetjournal.it	www.cetjournal.it
cet-15018	www.wri.org	https://www.wri.org/webform/download_publication?source_entity_type=node&source_entity_id=39609>
cet-15018	bibdigital.epn.edu.ec	http://bibdigital.epn.edu.ec/handle/15000/8710>
cet-15018	www.epa.gov	https://www.epa.gov/sites/default/files/2015-12/documents/99cr.pdf>