I don't have the exact references in front of me as they are in my office at
work but I expect you will find what you are interested in if you look for
the work by Chandra et al in the late 80's. If you are unable to find his
work (I believe there were several published articles) contact me directly.
Rhoda Taylor, B.A., I.B.C.L.C., Vancouver Island, Canada
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