(1)
Tilly Mándy, A.; Honfi, P.; Stefanovits-Bányai, É.; Mosonyi, I. D.; Köbli, V.; Hrotkó, K. The Effect of 5-Aminolevulinic-Acid (ALA) on the Development of Saintpaulia Ionantha. Int. j. hortic. sci. 2010, 16, 33-36..