Silva, Enedino Corrêa da, Vera Osorio da Fonseca, and José Alceu Infeld. 2014. “Sampling Study for a Social and Economic Research With Asparagus Farmers in Rio Grande Do Sul”. Pesquisa Agropecuaria Brasileira 8 (8):193-95. https://doi.org/10.1590/S1678-3921.pab1973.v8.17526.