Triangle cursor: interactions with objects above the tabletop. - Sven Strothoff; Dimitar Valkov; Klaus H. Hinrichs (ITS, 2011)

Adding context to multi-touch region selections. - Sven Strothoff; Klaus H. Hinrichs (MUM, 2013)

Multi-touch selection and interaction on and above the surface. - Sven Strothoff (2015)

Pins 'n' Touches: An Interface for Tagging and Editing Complex Groups. - Sven Strothoff; Wolfgang Stuerzlinger; Klaus H. Hinrichs (ITS, 2015)