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This began in his doctoral work leading to the Mordell–Weil theorem ( 1928 , and shortly applied in Siegel 's theorem on integral points ) .
 person: Mordell–Weil; person: Siegel
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: Mordell–Weil; person: Siegel