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2. J. von Neumann, O. Morgenstern, Theory of Games and Economic Behavior (Princeton University, Princeton, 1944)
3. L. Savage, The Foundations of Statistics (Wiley, New York, 1954)
4. J.W. Pratt, Econometrica 32, 122 (1964)
5. K.J. Arrow, Aspects of the Theory of Risk Bearing (Hahnsson Foundation, Helsinki, 1965)