Variation in Leaf Calcium in a Range of Apple Rootstocks. Journal of the American Pomological Society, [S. l.], v. 41, n. 1, p. 13–16, 1987. DOI: 10.71318/apom.1987.41.1.13. Disponível em: https://journal.americanpomological.org/index.php/jofaps/article/view/1713. Acesso em: 4 feb. 2026.