[1]
Díaz de Sumaza, Z.M. and Rodríguez de Zapata, L. 1972. Estimation on the Income Elasticity of Household Demand for Sweet Potatoes, Ipomoea batatas and Yams, Dioscorea Spp. The Journal of Agriculture of the University of Puerto Rico. 56, 4 (Oct. 1972), 432–438. DOI:https://doi.org/10.46429/jaupr.v56i4.10806.