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Selge, F., Hagel, H., Gunkel, G. and Doluschitz, R. 2015. ANNUAL RAINFALL VARIABILITY AND ECONOMICAL DEPENDENCY OF SMALLHOLDER AGRICULTURE IN THE SEMI-ARID NORTHEASTERN REGION OF BRAZIL. Revista Brasileira de Ciências Ambientais. 36 (Jun. 2015), 155–167. DOI:https://doi.org/10.5327/Z2176-947820151009.