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None of the authors is French :D

I didn't say that, just that the names sound French.
Excuse my ignorance if Belgian or even some Swiss names sound French to me! :P

Exactly @alexdory. That is why I said I will not guess again till I know it.

There is no need to know. iI prefer letting people dreaming about who I really am ;)

You are fully excused, don't worry (although I won't answer that easily) ;)

This being said, I am happy that at least two people (you and @noble-noah) made the effort of downloading the paper :D