Antal, G. et al. 2021. Effect of hydroponic and peat-free media in transplant production of Rudbeckia hirta varieties under different photoperiodic lighting and their photosynthetic parameters. International Journal of Horticultural Science. 27, (Aug. 2021), 110–117. DOI:https://doi.org/10.31421/ijhs/27/2021/9865.