1. Acevedo, E, Fereres, E, Hsiao, TC, and Henderson, DW, 1979 Diurnal growth trends, water potential, and osmotic adjustment of maize and sorghum leaves in the field, Plant Physiol, 64: 476
2. Akerman, A, 1927, Studien über den Kältetod und die Kälteresistanz der Pflanzen nebst Untersuchungen über die Winterfestigkeit des Weizens, Lund(Cited by Maximov, 1929; original not seen).
3. Alden, J and Hermann, RK, 1971, Aspects of the cold-hardiness mechanism in plants, Bot Review, 37: 37.
4. Bartel, AT, 1947, Some physiological characteristics of four varieties of spring wheat presumably differing in drought resistance, J Agr Res, 74: 97.
5. Begg, JE and Turner, NC, 1976, Crop water deficits, Adv.Agron, 28: 161.