Obeng, Isaac Antwarko and Adu, Kofi Osei (2014): Cost efficiency of cocoa farmers in Twifo Hemang Lower Denkyira Area in Central Region of Ghana.
Obeng, Isaac Antwarko and Adu, Kofi Osei (2016): Technical efficiency in Ghana's cocoa production: evidence from Twifo Hemang Lower Denkyira Area.
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