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In the summer of 1880 Knorr worked with Robert Wilhelm Bunsen at the University of Heidelberg , and later assisted Adolf von Baeyer in Munich .
 Knorr, Robert Wilhelm Bunsen, University of Heidelberg, Adolf von Baeyer, Munich
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Knorr, Robert Wilhelm Bunsen, University of Heidelberg, Adolf von Baeyer, Munich