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Lummer 's findings , along with others , on black body radiators led Max Planck to reconcile his earlier Planck 's law of black-body radiation by introducing the quantum hypothesis in 1900 .
 Lummer, Max Planck, Planck
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Lummer, Max Planck, Planck