Lecture 9: Fold-and-cut problem: straight-skeleton method, disk-packing method. Flattening polyhedra.
Page 1: Fold-and-cut problem, history, universality result, straight skeleton
The fold-and-cut page details some of the history, including scans from the Kan Chu Sen book.
You can view the original paper introducing straight skeletons by Aichholzer, Aurenhammer, Alberts, and Gärtner.
You can view the paper by Demaine, Demaine, and Lubiw describing the straight-skeleton method (sans dense spirality).
These are rough, personal lecture notes handwritten by Erik Demaine used during lecture. Their primary purpose is for reading/review by students of the class.