id	domain	url
cet-3610	www.aidic.it	www.aidic.it/cet
cet-3610	www.dnvgl.com	www.dnvgl.com/services/hazard-analysis-phast-1675
cet-3610	www.hse.gov.uk	www.hse.gov.uk/research/rrpdf/rr672.pdf
cet-3610	www.hse.gov.uk	www.hse.gov.uk/pubns/gasdetector.pdf