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In 1897 , Meyer became assistant of Ludwig Boltzmann at the Institute for Theoretical Physics , University of Vienna .
 person: Meyer; person: Ludwig Boltzmann; location: Vienna
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: Meyer; person: Ludwig Boltzmann; location: Vienna