id	domain	url
cet-9564	www.aidic.it	www.aidic.it/cet
cet-9564	www.sciencedirect.com	https://www.sciencedirect.com/science/article/pii/s0959652615001699#bbib26
cet-9564	www.sciencedirect.com	https://www.sciencedirect.com/science/article/pii/s0959652615001699#bbib26