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Later developments From the twenties onwards , Freud 's views of the inaccessibility of the narcissistic neuroses to analytic influence had been challenged , first by Melanie Klein , and then by object relations theorists more broadly .
 Freud, Melanie Klein
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
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Answer:
 Freud, Melanie Klein