Dobránszky, J., and N. Mendler-Drienyovszki. “Cytokinins Affect the Stomatal Conductance and CO2 Exchange of in Vitro Apple Leaves”. International Journal of Horticultural Science, vol. 20, no. 1-2, Apr. 2014, pp. 25-28., https://doi.org/10.31421/IJHS/20/1-2/1112.