Pasqual, M.; Lopes, P. A.; Arello, E. F.; Barros, I. de. Effects of 6-Benzylaminopurine, Sucrose and Agar on in Vitro Vitrification of Pear Tree. PAB 1991, 26 (11/12), 1919-1924. https://doi.org/10.1590/S1678-3921.pab1991.v26.3544.