1. Abegg, F.A., A genetic factor for the annual habit in beets and linkage relationship, J. Agric. Res., 1936, vol. 53, pp. 493–511.
2. Abou-Elwafa, S.F., Abdel-Rahim, M., Abou-Salama, A.M., and Teama, E.A., Effect of root age and day-length extension on sugar beet floral induction and fertility, World J. Agric. Res., 2013, vol. 1, no. 5, pp. 90–95.
3. Abou-Elwafa, S.F., Büttner, B., Kopisch-Obuch, F.J., Jung, C., and Müller, A.E., Genetic identification of a novel bolting locus in Beta vulgaris which promotes annuality independently of the bolting gene B, Mol. Breed., 2012, vol. 29, pp. 989–998.
4. Abou-Elwafa, S.F., Abdel-Rahim, M.H., Abou-Salama, A.M., and Teama, E.A., Sugar beet floral induction and fertility: Effect of vernalization and daylength extension, Sugar Tech., 2006, vol. 8, pp. 281–287.
5. Allard, R.W., Principles of Plant Breeding, New York, NY: John Wiley and Sons, 1960.