I too got curious, but the only thing that I have found is this paper from the University of Babylon: http://www.uobabylon.edu.iq/eprints/paper_2_29545_76.pdf

I too got curious, but the only thing that I have found is this paper from the University of Babylon: http://www.uobabylon.edu.iq/eprints/paper_2_29545_76.pdf http://www.uobabylon.edu.iq/eprints/paper_2_29545_76.pdf