1. Ballard, L. A. T., 1973, Seed Sci. Technol.
1:285–303 (seed coat effects).
2. Barton, L. V., 1965, in: Encyclopedia of Plant Physiology, Volume 15/2 (W. Ruhland, ed.), Springer, Berlin, pp. 909–924 (general review on dormancy types).
3. Barton, L. V., 1965, in: Encyclopedia of Plant Physiology, Volume 15/2 (W. Ruhland, ed.), Springer, Berlin, pp. 727–745 (coat-imposed dormancy).
4. Bewley, J. D., and Black, M., 1982, Physiology and Biochemistry of Seeds, Volume 2, Springer, Berlin (all aspects of dormancy).
5. Cavers, P. B., and Harper, J. L., 1966, J. Ecol.
54:367–382 (polymorphism in Rumex).