What is the hyperbolic plane? Can we crochet it?
What can you learn from your model?
Strands in the history of geometry
Tidbits from the history of crochet
What is non-Euclidean geometry?
Pseudosphere
Metamorphoses of the hyperbolic plane
Other surfaces with negative curvature
Looking for applications of hyperbolic geometry
Hyperbolic crochet goes viral
Appendix : how to make models.