Seed systems and crop genetic diversity in agroecosystems - Hodgkin, T.; Rana, R.; Tuxill, J.; Didier, B.; Subedi, A.; Már, I.; Karamura, R.; Valdivia, Roberto O.; Colledo, L.; Latournerie, L.; Sadiki, M.; Sawadogo, M.; et al. (International Plant Genetic Resources Institute, 2005)