Ribeiro, Márcia de Nazaré Oliveira, et al. “In Vitro Development of Calla Lily: Effect of Sucrose and Gibberellic Acid Concentrations”. Semina: Ciências Agrárias, vol. 30, no. 3, Oct. 2009, pp. 575-80, doi:10.5433/1679-0359.2009v30n3p575.