Pasqual, Moacir, Patrícia Andrade Lopes, Eduardo Fonseca Arello, and Inacio de Barros. 1991. “Effects of 6-Benzylaminopurine, Sucrose and Agar on <i>in vitro< i> Vitrification of Pear Tree”. Pesquisa Agropecuaria Brasileira 26 (11/12):1919-24. https://doi.org/10.1590/S1678-3921.pab1991.v26.3544.