53178
Owing respectively to Green 's theorem and the divergence theorem , such a field is necessarily a conservative one , and it is free from sources or sinks , having net flux equal to zero through any open domain without holes .
 Green
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Green