A Psychophysical Comparison of Two Stylus-Driven Soft Keyboards. - Michael Bohan; Chad A. Phipps; Alex Chaparro; Charles G. Halcomb (Graphics Interface, 1999)

Data Collection in the Palm of Your Hand: A Case Study. - Kelly A. Spain; Chad A. Phipps; Michael E. Rogers; Barbara S. Chaparro (Int. J. Hum. Comput. Interact., 2001)