I don't fully understand the process, but this paper has an explanation and diagrams: http://www.journalamme.org/papers_vol32_1/32110.pdf http://www.journalamme

I don't fully understand the process, but this paper has an explanation and diagrams: http://www.journalamme.org/papers_vol32_1/32110.pdf http://www.journalamme.org/papers_vol32_1/32110.pdf