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The theorem is named after Witold Hurewicz , and generalizes earlier results of Henri Poincaré .
 Witold Hurewicz, Henri Poincaré
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Witold Hurewicz, Henri Poincaré