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In a now-classic study ( 1959 ) , social psychologists John R. P. French and Bertram Raven developed a schema of sources of power by which to analyse how power plays work ( or fail to work ) in a specific relationship .
 person: John R. P. French; person: Bertram Raven
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Text: {0} 
Answer:
 person: John R. P. French; person: Bertram Raven