Source for artist on Greece 100 & 1000 drachmai 1935

Dear collectors Hello,

I read in here that the designer is Sébastien Laurent, which likely seems to be (same period of activity, similar design style and format).
However I would like to know more about the sources that mention his name for such works.

As the 50 have no artist, and based on the style, I think is done by Clément Serveau, which operates in the exact same period of time.
Except them, at that time, only Fraipont was active but the style doesn't really match.
It seems Serveau & Laurent start at the same time in 1930 with the serie designed for Uruguay.

Anyone have further informations to share?

Thank you very much,
- NumisDragon