IMPAD: an inexpensive multi-touchpressure acquisition device. - Ilya D. Rosenberg; Alexander Grau; Charles Hendee; Nadim Awad; Ken Perlin (CHI Extended Abstracts, 2009)

The UnMousePad: the future of touch sensing. - Ilya D. Rosenberg; Ken Perlin; Charles Hendee; Alex M. Grau; Nadim Awad (SIGGRAPH Emerging Technologies, 2009)

Mechanical force redistribution floor tiles. - Alex M. Grau; Charles Hendee; Arti S. Karkar; Huapeng Su; Michael Cole; Ken Perlin (CHI Extended Abstracts, 2014)

Mechanical force redistribution: enabling seamless, large-format, high-accuracy surface interaction. - Alex M. Grau; Charles Hendee; John-Ross Rizzo; Ken Perlin (CHI, 2014)