H. Werthner:
"E-tourism: History and Challenges";
Talk: RecTour 2016 - Workshop on Recommenders in Tourism at ACM RecSys 2016, Boston, MA, USA (invited); 2016-09-15; in: "Proceedings of the Workshop on Recommenders in Tourism", (2016).
http://www.ec.tuwien.ac.at/rectour2016/wp-content/uploads/Werthner_Keynote_RecTour2016.pdf