By Peter Potrowl - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=37293540
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Jean-Claude Guillebaud is currently considered a "single author." If one or more works are by a distinct, homonymous authors, go ahead and split the author.
Jean-Claude Guillebaud is composed of 2 names. You can examine and separate out names.