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Severini , independently from Dmitri Fyodorovich Egorov , proved and published earlier a proof of the theorem now known as Egorov 's theorem .
 Severini, Dmitri Fyodorovich Egorov, Egorov
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Severini, Dmitri Fyodorovich Egorov, Egorov