Complexity Science: A 'Grey' Science for the 'Stuff in Between'. - Kurt A. Richardson; Paul Cilliers; Michael Lissack (ICSTM, 2000)

Complexity and Philosophy - Francis Heylighen; Paul Cilliers; Carlos Gershenson (CoRR, 2006)

Complicated, complex, and compliant: best practice in obstetrics. - Sidney W. A. Dekker; Johan Bergström; Isis Amer-Wåhlin; Paul Cilliers (Cogn. Technol. Work., 2013)