Galli, Z., E. Kiss, G. Hrazdina, and L. Heszky. “The Effects of ACS (1-Aminocyclopropane-L-Carboxylate Synthase) Gene down Regulation on Ethylene Production and Fruit Softening in Transgenic Apple”. International Journal of Horticultural Science, vol. 9, no. 2, June 2003, pp. 65-70., doi:10.31421/IJHS/9/2/395.