Alene AD, VM Manyong and J Gockowski (2006). “The Production Efficiency of Intercropping Annual and Perennial Crops in Southern Ethiopia: A Comparison of Distance Functions and Production Frontiers.” Agricultural Systems 91(1-2): 51-70.

Alene AD, VM Manyong and J Gockowski (2006). “The Production Efficiency of Intercropping Annual and Perennial Crops in Southern Ethiopia: A Comparison of Distance Functions and Production Frontiers.” Agricultural Systems 91(1-2): 51-70.

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