Dear Mr. Huet,
Fascinated by the zipper since reading your publication, the authors of
the Haskell wikibook have written a special introduction to this data
structure:
"Theseus and the Zipper".
http://en.wikibooks.org/wiki/Haskell/Zippers
starring Theseus and Ariadne. We hope you will enjoy it :)
All the best,
apfelmus
