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His concept of recapitulation has been refuted in the form he gave it ( now called " strong recapitulation " ) , in favour of the ideas first advanced by Karl Ernst von Baer .
 Karl Ernst von Baer
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Karl Ernst von Baer