id	domain	url
cet-1328	www.aidic.it	www.aidic.it/cet
cet-1328	www.tango-nir.com	http://www.tango-nir.com/download.html
cet-1328	books.google.de	https://books.google.de/books?id=0dftnqeacaaj
cet-1328	www.aidic.it	http://www.aidic.it/cet/15/46/235.pdf