Reasoning with Projected Contours. - Chris John (Diagrams, 2004)

Measuring and Reducing Clutter in Euler Diagrams. - Chris John (Euler, 2004)

Exploring the Notion of 'Clutter' in Euler Diagrams. - Chris John; Andrew Fish; John Howse; John Taylor 001 (Diagrams, 2006)

A Normal Form for Euler Diagrams with Shading. - Andrew Fish; Chris John; John Taylor 001 (Diagrams, 2008)