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This approximation is broken to a slight extent in the solution to the Dirac equation ( where the energy depends on and another quantum number ) , and by the effect of the magnetic field of the nucleus and quantum electrodynamics effects .
 Dirac
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Dirac