1. Justice, O. L. & Bass, L. N. in Principles and Practice of Seed Storage 26 (Agriculture Handbook No. 506, Castle-House, Beccles & London, 1979).
2. Zheng, G. H., Shi, Z. L., Zhao, T. F. & Tao, K. L. in The Practical Seed Physiology 371-423 (Agriculture Publishing House, Beijing, 1990).
3. Paroda, R. C. & Arora, R. K. in Plant Genetic Resources Conservation and Management 16-18 (IBPGR Regional Office, Malhotra Publishing House, New Delhi, 1991).
4. Zheng, G. H. Scientia Agricultural Sinica 13, 37–43 (1980).
5. Zheng, G. H. Chinese Biodiversity 2 (suppl.), 61-65 (1994).