5930
They said they were ready to force their way back across post-war ethnic lines to Serb-held Doboj , one of several towns where NATO troops fear violence involving refugees determined to vote where they once lived .
 NATO, Serb-held, Doboj
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 NATO, Serb-held, Doboj