Kluwer Law International, 1996
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Boulding, Kenneth E. (Kenneth Ewart), 1910-1993, author
Harper, 1963
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Editoriale Scientifica, 1980
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Morton Deutsch, Peter T. Coleman
Jossey-Bass Publishers, 2000
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Schachter, Oscar, 1915-, author
Martinus Nijhoff , 1991
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