See http://www.geom.umn.edu/~lori/homework1.A1.txt.
See http://www.geom.umn.edu/~lori/homework1.A2.txt.
See an example of a picture I have already scanned in myself at http://www.geom.umn.edu/~lori/small/mouse.gif.
Kerry Hanifl and Jeanette Polanski