Spybuster - a community-based privacy tagging platform. - Johannes Kiemer; Till Ballendat; Tim Langer; Wenqi Zhang; Alexander De Luca (Mobile HCI, 2008)

Proxemic interaction: designing for a proximity and orientation-aware environment. - Till Ballendat; Nicolai Marquardt; Saul Greenberg (ITS, 2010)

Proxemic interactions: the new ubicomp? - Saul Greenberg; Nicolai Marquardt; Till Ballendat; Rob Diaz-Marino; Miaosen Wang (Interactions, 2010)

Gradual engagement: facilitating information exchange between digital devices as a function of proximity. - Nicolai Marquardt; Till Ballendat; Sebastian Boring; Saul Greenberg; Ken Hinckley (ITS, 2012)