W. Vendrame, R. Takane, L. Cardoso, L. Alvarez, and R. Tadeu, “Cryopreservation of seeds of Melocactus zehntneri Braun ex Ritter f. and Cereus gounellei Luetzelb ex Schum k. by the vitrification method”, Agron. Sci. Biotechnol., vol. 6, pp. 1-7, May 2020.