Tilly Mándy, A., Honfi, P., Stefanovits-Bányai, É., Mosonyi, I. D., Köbli, V., & Hrotkó, K. (2010). The effect of 5-aminolevulinic-acid (ALA) on the development of Saintpaulia ionantha. International Journal of Horticultural Science, 16(5), 33-36. https://doi.org/10.31421/IJHS/16/5/931