1. Agnew NH, Albrecht ML, Kimmis RK (1985) Hortic Sci 20:118
2. Auer CA, McDonnell DB (1984) Hortic Sci 19:517
3. Bernier G, Kinet JM, Sachs R (1981) The physiology of flowering, vol 1 and 2. CRC Boca Raton, Florida
4. Cameron AC, Raid MS (1983) Sci Hortic (Amst) 19:373
5. Cameron AC, Fenton CAL, Yu Y, Adams DO, Yang SF (1979) Hortic Sci 14:178