Arthur L. Besse - after the round tables held at Besse in France. (The "L." is for Lancelot.)

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From Wikipedia, [Arthur Besse](https://en.wikipedia.org/wiki/Arthur_Besse) is a pseudonym chosen by a group of French differential geometers, led by Marcel Berger, following the model of Nicolas Bourbaki. A number of monographs have appeared under the name.