See also discussion (2007) at http://lambda-the-ultimate.org/node/2003 http://lambda-the-ultimate.org/node/2003 (which mentions http://pll.cpsc.ucalgary.ca/cha

See also discussion (2007) at http://lambda-the-ultimate.org/node/2003 http://lambda-the-ultimate.org/node/2003 (which mentions http://pll.cpsc.ucalgary.ca/charity1/www/home.html http://pll.cpsc.ucalgary.ca/charity1/www/home.html )