1. Valuation of genetic resources;Brown,1990
2. Evenson, R.E., Gollin, D. (Eds.), 2003. Crop Variety Improvement and Its Effect on Productivity: the Impact of International Research. CAB International, Wallingford, UK.
3. Optimal collection and search for crop genetic resources;Evenson,1998
4. Introduction and overview: agricultural values of plant genetic resources;Evenson,1998
5. Food and Agriculture Organization of the United Nations (FAO), 1998. The State of the World's Plant Genetic Resources for Food and Agriculture. Food and Agriculture Organization of the United Nations, Rome, p. 510.