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[Jérôme Duriez <Jerome.Duriez@xxxxxxxxxx>]

> The Poisson ratio is even
> more confusing, it is a ratio between shear and normal
> "stiffness" (modulus actually :-), so it has no physical correlation
> with continuum Poisson ratio,
I have no feeling yet about the physical correlation, but I think there 
are some numerical ones at least

See, for example http://www.springerlink.com/content/16688jw766197204/ 
and probably plenty of other articles, including surely Bruno's thesis 
(you are lucky enough to be able to read french Benoît !)