The 5ESS switching system: Hardware design. - John C. Borum; John Janik; Robert F. Metz; Jesse Russell; D. Paul Smith; Eugene J. Theriot (AT&T Tech. J., 1985)

Software productivity and quality measurements. - D. Paul Smith; Weider D. Yu; Kiichi Fujino; James R. Hemsley; Gerald J. Knutson; Donald J. Reifer; William B. Smith (COMPSAC, 1991)

Software productivity measurements. - Weider D. Yu; D. Paul Smith; Steel T. Huang (COMPSAC, 1991)