internships (in collaboration with D. Pasquier~\cite{Pasquierc})?
We then formalized these time-indexed variables into {\bf vector variables},
where a variable is modeled by a time-set vector.
-Then, Julien Blanchard~\cite{Blanchard}, in collaboration with Fabrice Guillet and
+Then, Julien Blanchard~\cite{Blanchardd}, in collaboration with Fabrice Guillet and
Régis, defined {\bf sequential variables} modelled by a Poisson process in a
different way.
So many new concepts and new fields of application born of various