The latest Rietan distribution is available from:

  http://www.nirim.go.jp/~izumi/rietan/angle_dispersive/angle_dispersive.html

  http://www.ccp14.ac.uk/ccp/web-mirrors/rietan/~izumi/rietan/angle_dispersive/angle_dispersive.html
  ftp://ftp.minerals.csiro.au/pub/xtallography/ccp14/ccp/web-mirrors/rietan/~izumi/rietan/angle_dispersive/angle_dispersive.html
  http://ccp14.sims.nrc.ca/ccp/web-mirrors/rietan/~izumi/rietan/angle_dispersive/angle_dispersive.html