@PROCEEDINGS{hennecke2011OpticalPressureSensing,
   editor = {Fabian Hennecke, Franz Berwein, Andreas Butz},
   title = {Optical Pressure Sensing for Tangible User Interfaces},
   booktitle = {ITS},
   year = {2011},
   publisher = {ACM},
   keywords = {pressure, sensing, tracking, tangible user interface, FTIR, DI, DSI, interaction}
}