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When such a theory is quantized , the quanta of the gauge fields are called gauge boson s. If the symmetry group is non-commutative , the gauge theory is referred to as non-abelian , the usual example being the Yang – Mills theory .
 Yang, Mills
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Yang, Mills