Ferreira da Silva, P.R., Wendt, W. and Brondani da Rocha, A. (1997) “Effect of soil management system and fertilization level on sunflower cultivated after Avena strigosa”, Pesquisa Agropecuaria Brasileira, 32(6), pp. 641–647. doi:10.1590/S1678-3921.pab1997.v32.4694.