Souza, Zilmar da Silva, Fernando Macedo Barcellos, and Otto Carlos Koller. 2014. “Effects Op Gibberellins GA4 7 and Cytokinin 6-BA on the Apple Fruit”. Pesquisa Agropecuaria Brasileira 17 (11): 1639-46. https://doi.org/10.1590/S1678-3921.pab1982.v17.16383.