Szarvas, P.; Zsila-André, A.; Kováts, Z.; Fári, M. G. Micropropagation of Rudbeckia Hirta L. From Seedling Explants. Int. j. hortic. sci. 2005, 11 (2), 105-108. https://doi.org/10.31421/IJHS/11/2/588.