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In 1982 , he obtained a Ph.D. in Law 1982 at the Katholieke Universiteit Leuven , with a comparative study analysing the constitutional case-law of the European Court of Justice and the American Supreme Court .
 Katholieke Universiteit Leuven
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 Katholieke Universiteit Leuven