> http://www.math.missouri.edu/~stephen/naturalmath/ ok > http://www.math.missouri.edu/~stephen/naturalmath/naturalmath-0.5.tar.gz ok > http://www.math.missouri.edu/~stephen/software/#xkbset ok > http://www.math.missouri.edu/~stephen/software/xkbset/xkbset-0.5.tar.gz ok