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Daniel Bertaux ( born 27 February 1939 ) is a French sociologist ( Ecole des hautes etudes des sciences sociales , Centre d'etude des mouvements sociaux CEMS ) who is best known of initiating a research approach to use and study biographies in sociology .
 Daniel Bertaux
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Daniel Bertaux