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The second early 19th century development , that of Abelian integrals , would lead Bernhard Riemann to the development of Riemann surfaces .
 person: Abelian; person: Bernhard Riemann
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:
 person: Abelian; person: Bernhard Riemann