Peixoto, J.R. and Carvalho, M.L.M. de 1996. Effect of urea, zinc sulphate and boric acid on yellow passion fruit seedling development. Pesquisa Agropecuaria Brasileira. 31, 5 (May 1996), 325–330. DOI:https://doi.org/10.1590/S1678-3921.pab1996.v31.4488.