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Ristić 's reputation was enhanced by the series of negotiations which ended in the peaceful withdrawal of the Turkish troops from the Serbian fortresses in 1867 .
 Ristić, Turkish, Serbian
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ristić, Turkish, Serbian