Dobránszky, J., et al. “Effects of Different Cytokinins on the Shoot Regeneration from Apple Leaves of ’Royal Gala’ and ’M.26’”. International Journal of Horticultural Science, vol. 10, no. 1, Mar. 2004, pp. 69-75., https://doi.org/10.31421/IJHS/10/1/442.