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In 1969 – 70 , Yoichiro Nambu , Holger Bech Nielsen , and Leonard Susskind recognized that the theory could be given a description in space and time in terms of strings .
 Yoichiro Nambu, Holger Bech Nielsen, Leonard Susskind
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Yoichiro Nambu, Holger Bech Nielsen, Leonard Susskind