D. A. García-González, M. D. S. Santos-Diaz, J. P. Flores-Margez, and P. Osuna-Ávila, “Influence of Ca2+, pH, agar and plant growth regulators in the in vitro propagation of Echinocactus parryi (Engelm)”, Terra Latinoam, vol. 38, no. 3, pp. 489–498, Jul. 2020.