I am very happy to see that he is actual in this forum.
On December 8th, 1998, there was a seminar at the French Academy
for the 100th year of his birth.
My father Jacques, cousin Benoit MANDELBROT, and I were there,
with his students and colleagues.
We have archives that we may share with pleasure with anybody
interested, including founding papers from BOURBAKI to wich S.M.
participated.
Feel comfortable to contact me or my father at
for any questions.