[1XReferences[0X [[20XEll[15X] [16XEllis, G.[15X, [17XHomological Algebra Programming[15X, http://hamilton.nuigalway.ie/Hap/www/ -------------------------------------------------------
[1XReferences[0X [[20XEll[15X] [16XEllis, G.[15X, [17XHomological Algebra Programming[15X, http://hamilton.nuigalway.ie/Hap/www/ -------------------------------------------------------