Till Plumbaum Andreas Lommatzsch Ernesto William De Luca Sahin Albayrak SERUM: Collecting Semantic User Behavior for Improved News Recommendations. 402-405 2011 UMAP Workshops https://doi.org/10.1007/978-3-642-28509-7_37 https://www.wikidata.org/entity/Q64060401 conf/um/2011w db/conf/um/umap2011w.html#PlumbaumLLA11