Knowledge engineering for software design. - Christopher Westphal (ACM SIGSOFT Softw. Eng. Notes, 1988)

Reproducibility of the word frequency effect: comparison of signal change and voxel counting. - Michael W. L. Chee; Hwee Ling Lee; Chun Siong Soon; Christopher Westphal; Vinod Venkatraman (NeuroImage, 2003)

Word frequency and subsequent memory effects studied using event-related fMRI. - Michael W. L. Chee; Christopher Westphal; Joshua Oon Soo Goh; Steven Graham; Allen W. Song (NeuroImage, 2003)