We can be a coauthor of research articles, and tj yfvt some of one who died.

For example, I am coauthor with Jean-Marie Hubac, a colleague who is no longer alive and B.Bentam, an other colleague, who was our student from Algeria, but I do not have his current coordinate.

Or the collègues: M. Danilova, Yu. Mazel, E. Lopez ...

All point of view is appreciated

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