Mindêllo Neto, Ubirajara Ribeiro. “Hardwood Cuttings Rooting of Plum Tree Cultivars With Application of Indolbutyric Acid and Hydrogen Cyanamide”. Pesquisa Agropecuaria Brasileira, vol. 41, no. 3, Mar. 2006, pp. 529-31, doi:10.1590/S1678-3921.pab2006.v41.7169.