Silva, R.C. da et al. 2013. Adaptation of the tetrazolium test for assessment of sunflower seed viability and vigor. Pesquisa Agropecuaria Brasileira. 48, 1 (Mar. 2013), 105–113. DOI:https://doi.org/10.1590/S1678-3921.pab2013.v48.12600.