Multi-user Collaboration on Complex Data in Virtual and Augmented Reality - Adrian Heinrich Hoppe; Kai Westerkamp; Sebastian Maier; Florian van de Camp; Rainer Stiefelhagen (HCI International 2018 - Posters' Extended Abstracts - 20th International Conference, HCI International 2018, Las Vegas, NV, USA, July 15-20, 2018, Proceedings, Part II, 2018)