Stefan Lüdtke, Max Schröder, Frank Krüger 0001, Thomas Kirste. Where are my colleagues?: Tracking and Counting Multiple Persons using Lifted Marginal Filtering. In Kristina Yordanova, Max Schröder, Sebastian Bader, Thomas Kirste, editors, Proceedings of the 4th international Workshop on Sensor-based Activity Recognition and Interaction, iWOAR 2017, Rostock, Germany, September 21 - 22, 2017. ACM, 2017.