@inproceedings{cccg-06 , title = "Polygons Flip Finitely: Flaws and a Fix" , author = "Erik D. Demaine, Blaise Gassend, Joseph O'Rourke and Godfried T. Toussaint" , booktitle = "Proceedings of the 18th Canadian Conference on Computational Geometry (CCCG'06)" , site = "Kingston" , year = 2006 , pages = "109--112" }