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[30] V. Kaitala G. Leitmann: Stabilizing employment in a fluctuating resource economy. J. Optim. Theory Appl. 67(1990), 1-16. MR 1552219

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[42] G. Leitmann S. Pandey: Aircraft control for flight in an uncertain environment: Takeoff in windshear. J. Optim. Theory Appl. 70 (1991), 25-55. MR 1116221

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