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		| I have a very specific question: - if it is a Persian model, why is it ignored by Manouchehr ?
 - if it is a Indian model, why is it ignored by G. N. Pant ?
 - if it is a Turkish model, what is the reference? I didn't find it in any book
 
 I would like to have a scientific source.
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 All good questions and I hope we have someone here who can answer them.