1. Alston, F.H., 1983. Progress in transferring mildew (Podosphaera leucotricha) resistance from Malus species to the cultivated apple. IOBC Bull. Integrated Control in Orchards, INRA, Angers, pp. 87–95.
2. Buscaroli, C. & S. Sansavini, 1991. Le forme spur nelle antiche varietà di melo. Frutticoltura 1: 69–74.
3. Crosby, J.A., J. Janick, P.C. Pecknold, S.S. Korban, P.A. O’Connor, S.M. Ries, J. Goffreda & A. Voordeckers, 1992. Breeding apples for scab resistance: 1945-1990. Fruit Varieties Journal 46(3): 145–166.
4. Faust, M. & S.W. Zagaya, 1984. Prospect for developing low vigor fruit tree cultivars. Int. Workshop Controlling Vigor in Fruit Trees. Acta Hort. 146:21–27.
5. Gallott, J.C., R.C. Lamb & H.S. Aldwinckle, 1985. Resistance to powdery mildew from some small-fruited Malus cultivars. HortScience 20(6): 1085–1087.