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The same paradox had been discovered in 1899 by Ernst Zermelo but he did not publish the idea , which remained known only to David Hilbert , Edmund Husserl , and other members of the University of Göttingen .
 Ernst Zermelo, David Hilbert, Edmund Husserl, University of Göttingen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Ernst Zermelo, David Hilbert, Edmund Husserl, University of Göttingen