Chapter 20

www.geom.uiuc.edu/software/tilings

www.reocities.com/SiliconValley/Pines/1684/Penrose.html

www.geom.uiuc.edu/apps/quasitiler

www.geometrygames.org/

www.geometrygames.org/KaleidoTile/index.html

demonstrations.wolfram.com/ComplementTiling/

www.eschertiles.com/links.html

www.angelfire.com/mn3/anisohedral/isohedral.html