Ribeiro, V.G. et al. 1997. Effects of pH and agar on <i>in vitro</i> embryo culture of orange cv. Pêra. Pesquisa Agropecuaria Brasileira. 32, 11 (Nov. 1997), 1147–1152. DOI:https://doi.org/10.1590/S1678-3921.pab1997.v32.4760.