id	domain	url
cet-5719	www.aidic.it	www.aidic.it/cet
cet-5719	www.nrel.gov	http://www.nrel.gov/docs/legosti/fy96/8142v1.pdf
cet-5719	usda01.library.cornell.edu	http://usda01.library.cornell.edu/usda/current/livestock-poultry-ma/livestock-poultry-ma-11-082013.pdf