1. Alum, N. and Magherini, R. (1995) Apple production in strictly tropical zones: First observations in Nigeria. Acta Horticulturae, 409, 25–38.
2. Anderson, J.L., Ashcroft, G.L., Richardson, A.E., Alfaro, J.F., Griffin, R.E., Hanson. G.R. and Keller, J. (1975) Effects of evaporative cooling on temperature and development of apple buds. Journal of the American Society for Horticultural Science, 100 (3), 229–231.
3. Avenant, J.H. (1989) Construction of trellising systems with hail protection. Deciduous Fruit Grower, 39 (6), 185–190.
4. Basso, C. and Wilms, F.W. (1988) Nutritional status of apple orchards in Southern Brazil. Acta Horticulturae, 232, 187–192.
5. Beattie, B.B. and Folley, R.R.W. (1978) Production variability in apple crops II. The long term behaviour of the English crop, Scientia Horticulturae, 8, 325–332.