I published an article in French on the subject in the magazine Pour la Science, special edition April 1997 on the Science of Knots, available as an on line version.
You can download an example from the article containing an illumination (200KB jpg) and calligraphy by Chantal Fachinetti.
I also created a web site in French describing the method, and that remains the official site. This version in English is for those not fluent in French!
Steve Abbott helped translate this site from the French and has also written a computer program that implements this method; you can find it at Steve Abbott's Computer Drawn Celtic Knotwork.
First-time readers are advised to skip the Introduction and go straight to the Design section
Introduction
A litle theory
Interlacings
Reidemeister movements
Graphs
Movements
Design
Introduction
The method
Cosmetics
Walls
Création
Introduction
The Grid
The two methods
Towards the exterior
Encapsulation
Towards the interior
Animals, people, entanglements
Semi-encapsulation
