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Agricultural Systems > 2004 > 79 > 1 > 55-81
Agricultural Systems > 2004 > 79 > 1 > 83-107
Agriculture, Ecosystems and Environment > 2002 > 88 > 3 > 233-248
Agriculture, Ecosystems and Environment > 2002 > 88 > 3 > 215-232
Agriculture, Ecosystems and Environment > 2002 > 88 > 3 > 249-269