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His works had inspired leading Soviet rocket engineers such as Sergei Korolev , Valentin Glushko , and many others that contributed to the success of the Soviet space program at early stages of the Space Race and beyond .
 Sergei Korolev, Valentin Glushko
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sergei Korolev, Valentin Glushko