@article{,
	author          = {F. Abel, E. Herder, G.J. Houben, N. Henze, D. Krause},
	title           = {Cross-system User Modeling and Personalization on the Social Web},
	journal         = {UMUAI, User Modeling and User-Adapted Interaction journal},
	year            = {2013},
	volume          = {23},
	number          = {2-3},
	pages           = {169-209. Springer},
	group           = {WIS}
}