Challenge on context-aware movie recommendation: CAMRa2011. - Alan Said; Shlomo Berkovsky; Ernesto William De Luca; Jannis Hermanns (RecSys, 2011)

Recommender systems challenge 2012. - Nikos Manouselis; Alan Said; Domonkos Tikk; Jannis Hermanns; Benjamin Kille; Hendrik Drachsler; Katrien Verbert; Kris Jack (RecSys, 2012)