311995
After this proof he found a new proof based on his study of incompressible tori in knot complements ; he published this work Knoten und Vollringe in Acta Mathematica , where he defined satellite and companion knots .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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