Lessons learned implementing STEP-NC AP-238. - Martin Hardwick; David Loffredo (Int. J. Comput. Integr. Manuf., 2006)

Challenges and Choices in the Specification and Implementation of the STEP-NC AP-238 Standard. - Martin Hardwick; David Loffredo (J. Comput. Inf. Sci. Eng., 2007)

Enabling the Crowd Sourcing of Very Large Product Models. - Martin Hardwick; David Loffredo; Joe Fritz; Mikael Hedlind (NEW PROLAMAT, 2013)