Szarvas, Pál, Anikó Zsila-André, Zoltán Kovács, and Miklós Gábor Fári. 2006. “Micropropagation of Rudbeckia Hirta L. From Seedling Explants”. Acta Agraria Debreceniensis, no. 22 (May):53-59. https://doi.org/10.34101/actaagrar/22/3191.