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According with Trevor J. Cox and Peter D'Antonio page 236 chapter 9.3 from the book ''Acoustic Absorbers and Diffusers'' (by the way very good book if you want to buy it)
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thats an expensive book.....around a 100 pounds
looks pretty comprehensive though...
i had been thinking about getting a good on book on diffusion and absorption....guess ill have to save my money for a bit....