Campbell, A. T., & Athayde, M. L. F. (2014). Effect of sowing date on the behavior of two genotypes of sunflower. I. Phenological and agronomical aspects. Pesquisa Agropecuaria Brasileira, 23(4), 371–378. https://doi.org/10.1590/S1678-3921.pab1988.v23.13860