Z. Galli, 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”, Int. j. hortic. sci., vol. 9, no. 2, pp. 65–70., Jun. 2003, doi: 10.31421/IJHS/9/2/395.