Haptic props: semi-actuated tangible props for haptic interaction on the surface. - Dimitar Valkov; Andreas Mantler; Klaus H. Hinrichs (UIST (Adjunct Volume), 2013)

Haptic Prop: A Tangible Prop for Semi-passive Haptic Interaction. - Dimitar Valkov; Andreas Mantler; Lars Linsen (VR, 2019)