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+@inproceedings{said2013month,
+  title={A month in the life of a production news recommender system},
+  author={Said, Alan and Lin, Jimmy and Bellog{\'\i}n, Alejandro and de Vries, Arjen},
+  booktitle={Proceedings of the 2013 workshop on Living labs for information retrieval evaluation},
+  pages={7--10},
+  year={2013},
+  organization={ACM}
+}
+
+@inproceedings{esiyok2014users,
+  title={Users' reading habits in online news portals},
+  author={Esiyok, Cagdas and Kille, Benjamin and Jain, Brijnesh-Johannes and Hopfgartner, Frank and Albayrak, Sahin},
+  booktitle={Proceedings of the 5th Information Interaction in Context Symposium},
+  pages={263--266},
+  year={2014},
+  organization={ACM}
+}
+
+
+@inproceedings{nguyen2014exploring,
+  title={Exploring the filter bubble: the effect of using recommender systems on content diversity},
+  author={Nguyen, Tien T and Hui, Pik-Mai and Harper, F Maxwell and Terveen, Loren and Konstan, Joseph A},
+  booktitle={Proceedings of the 23rd international conference on World wide web},
+  pages={677--686},
+  year={2014},
+  organization={ACM}
+}