BRUWER, F.; DU TOIT, W.; BUICA, A. Nitrogen and Sulphur Foliar Fertilisation. South African Journal of Enology and Viticulture, [S. l.], v. 40, n. 2, p. 237–252, 2019. DOI: 10.21548/40-2-3281. Disponível em: https://www.journals.ac.za/index.php/sajev/article/view/3281. Acesso em: 10 mar. 2026.