His principal work is the Cours de G/eom/etrie Diff/erentielle
Locale which appeared in Julia's Cahiers in Paris 1957 - a most
valuable textbook still today. There is a russian translation by
S.P.Finikov from 1960.
I remember him from a talk he gave in Berlin at the time of this
book's appearance; he seemed to be in his mid-fifties then.
W.F.