id	domain	url
ger-81	link.springer.com	http://link.springer.com/chapter/10.1007/978-946209-437-6_3
ger-81	ojs.lboro.ac.uk	https://ojs.lboro.ac.uk/ojs/index.php/date/article
ger-81	scholar.lib.vt.edu	http://scholar.lib.vt.edu/ejournals/jte/v24n1/dixo
ger-81	spie.org	http://spie.org/documents/etop/2013/4_concept
ger-81	ejournals.library.ualberta.ca	https://ejournals.library.ualberta.ca/index.php/ijq