Lederman, I. E., Ferreira da Silva, M. F., Fernandes Bezerra, J. E., & dos Santos, V. F. (1997). Influence of rootstocks age and grafting methods on the vegetative propagation of soursop. Pesquisa Agropecuaria Brasileira, 32(6), 613–615. https://doi.org/10.1590/S1678-3921.pab1997.v32.4692