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[ 8 ] Y. Chen and M. Florian ( 1992 ) , “ On the geometry structure of linear bilevel programs : a dual approach ” Technical Report CRT-867 , Centre de recherche sur les Transports .
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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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