Some related notes on simplification from a course by Hebert Edelsbrunner: L08,
L12, L13, L15.
The 2007 Siggraph course notes on Geometric Modeling Based on Polygonal Meshes by Mario Botsch, Mark Pauly, Leif Kobbelt, Pierre Alliez, Bruno Levy, Stephan Bischoff, and Christian Rössl