Non-software examples of software design patterns. - Michael Duell; John Goodsen; Linda Rising (OOPSLA Addendum, 1997)

Non-software examples of PoSA patterns. - Michael Duell; Linda Rising; Peter Sommerlad; Michael Stal (OOPSLA Addendum, 1998)

Looking Beyond Software to Understand Software Design Patterns. - Michael Duell (COMPSAC, 1999)