D. Jannach, J. Freyne, W. Geyer, I. Guy, A. Hotho, and B. Mobasher. Eighth ACM Conference on Recommender Systems, RecSys '14, Foster
City, Silicon Valley, CA, USA - October 06 - 10, 2014, page 395. ACM, (2014)
M. Kubatz, F. Gedikli, and D. Jannach. E-Commerce and Web Technologies, volume 85 of Lecture Notes in Business Information Processing, Springer Berlin Heidelberg, (2011)