id	domain	url
cet-2333	www.aidic.it	www.aidic.it/cet
cet-2333	www.sciencedirect.com	http://www.sciencedirect.com/science/article/pii/s095965261300509x#fd5
cet-2333	www.sciencedirect.com	http://www.sciencedirect.com/science/article/pii/s095965261300509x#fd6
cet-2333	www.sciencedirect.com	http://www.sciencedirect.com/science/article/pii/s0360319912012669#bib1