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References
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1 Immanuel Kant, `Perpetual Peace: A Philosophical Sketch', in Hans Reiss, ed., Kant: Political Writings , 2nd edn, trans. H. B. Nisbet (Cambridge: Cambridge University Press, 1991), pp. 93-130, on p. 96.
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2 Michael Walzer, Just and Unjust Wars: A Moral Argument with Historical Illustrations (New York: Basic Books, 1977), p. 216.
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3 We owe the formulation of this important point to Dan Smith, former director of PRIO.
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4 For an illuminating discussion of the `indirect approach', with application to 20th-century revolutionary warfare, see Général André Beaufre, La guerre révolutionnaire: Les formes nouvelles de la guerre [Revolutionary War: New Forms of War] (Paris: Fayard, 1972).