Levi, Edward H., author
London: The University of Chicago Press, 1949,
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Neumann, Richard K., author
Wolters Kluwer Law & Business, 2013
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Kiikeri, Markku
Kluwer Academic Publishers, 2001
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Lipshaw, Jeffrey, author
Routledge, 2017
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Johnson, Conrad D., author
Cambridge University Press, 1991
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