Wilson, R.L. 1989. Minimizing extraneous transfer of sunflower pollen by honey bees (Hymenoptera: Apidae) in field cages. Journal of Kansas Entomology Society 62:387–391. Wilson, R.L. and V.L. Collison. 1988.
Endowing Future Harvests: The Long-term Costs of Conserving Genetic Resources at the CGIAR Centres
... Engels, J.M.M. and B. Visser. 2003. A guide to effective management of germplasm collections. Handbook for Genebanks No. 6. International Plant Genetic Resources Institute, Rome, Italy. 69 In vitro germplasm collection management.
... efficient and cost - effective management are discussed , in a recent publication by Engels and Visser ( 2003 ) . Further reading Engels , J.M. and Visser , L. ( eds . ) . 2003. A guide to effective management of germplasm collections .
... Gene flow and introgression from domesticated plants into their wild relatives. Annual Review of Ecology and Systematics 30:539–563. Engels JMM and Visser L. 2003. A guide to effective management of germplasm collections. Handbooks for ...