J. E. S. Pereira, G. R. de L. Fortes, and J. B. da Silva, “Growth of micropropagated apple plants in greenhouse with gibberellic acid applications”, PAB, vol. 36, no. 6, pp. 881–886, Jun. 2001, doi: 10.1590/S1678-3921.pab2001.v36.6207.