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According to researcher and author Krisztián Ungváry , some 38,000 civilians died during the siege : about 13,000 from military action and 25,000 from starvation , disease and other causes .
 Krisztián Ungváry
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Krisztián Ungváry