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At the conclusion of the war , he returned to the University of Paris to continue his studies with Paul Langevin , and was awarded his " Docteur ès science " in 1920 .
 organization: University of Paris; person: Paul Langevin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: University of Paris; person: Paul Langevin