Dear Christophe,

Many thanks for your response. I, actually, thought that my question would be read by the Researchgate admin who could help Researchgate to find my paper.

I see that, instead, my question became visible to the public, not to the admin. 

Do you happen to know how to contact the admin?

Thanks again,

Michael

Dear Christophe,

Thank you very much for your help !!

Michael