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In the beginning , he studied under Jacob Volhard ; then , after Volhard left for the University of Erlangen , Hermann Emil Fischer became his tutor .
 Jacob Volhard, Volhard, University of Erlangen, Hermann Emil Fischer
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Jacob Volhard, Volhard, University of Erlangen, Hermann Emil Fischer