- Loughman, B. C. (3)
- International Symposium on Genetic Aspects of Plant Mineral Nutrition (2)
- Dambroth, M. (Manfred) (1)
- El Bassam, Nasir (1)
- Gabelman, W. H. (1)
- Gašparíková, O. (1)
- Institut für Pflanzenbau und Pflanzenzüchtung (Braunschweig, Germany) (1)
- International Symposium on Structure and Function of Roots (1)
- Kolek, Jozef (1)
- University of Wisconsin--Madison (1)