资料来源 : Free On-Line Dictionary of Computing

JAffer's Canonical ALgebra
     
         (JACAL) A {symbolic mathematics} program,
        most of which was written in {Scheme} by Aubrey Jaffer.
     
        {Home (http://swissnet.ai.mit.edu/~jaffer/JACAL.html)}.
     
        (1999-06-27)