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Russia's agriculture : eight years in transition - convergence or divergence of regional efficiency
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Determinants of productivity and efficiency of wheat production in Kazakhstan : a stochastic frontier approach
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Russia's agriculture: eight years in transition - convergence or divergence of regional efficiency
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A Luenberger-Hicks-Moorsteen productivity indicator : its relation to the Hicks-Moorsteen productivity index and the Luenberger productivity indicator
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Non-convex technologies and cost functions : definitions, duality and nonparametric tests of convexity