@article{LuS13,
	author = {Lutz, David and Stiller, Burkhard},
	doi = {10.1109/SURV.2013.032713.00098},
	issn = {1553-877X},
	journal = {Communications Surveys \& Tutorials},
	month = {apr},
	number = {99},
	pages = {1-21},
	publisher = {IEEE},
	title = {A Survey of Payment Approaches for Identity Federations in Focus of the SAML Technology},
	volume = {2013},
	year = {2013}
}