R. Gordón-M., I. Camargo, J. Franco, and A. González, “RAINFALL IMPACT ON THE GRAIN CORN YIELD IN AZUERO REGION, PANAMA, 1995-2003. II. YIELD ANALYSIS AND ITS RELATIONSHIP WITH THE PLANTING DATE.”, ciencia-agropecuaria, no. 16, pp. 31-44, Jun. 2004.