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In general relativity , the relativistic disk refer to a class of axi-symmetric self-consistent solutions to Einstein 's field equations ( or Einstein-Maxwell 's field equations ) corresponding to the gravitational field generated by axi-symmetric isolated sources .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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