by John G. Kie
G. C. Ennik
Symposium on Recent Developments in the Use of New Sources of Protein, Essential Amino Acids, and Non-protein Nitrogen, with Special Reference to Ruminants Geneva 1977.
Research Co-ordination Meeting and Panel on Tracer Techniques in Studies on the Use of Non-Protein Nitrogen (NPN) in Ruminants Vienna 1974.
Ray L. Shirley
European Grassland Federation. International Symposium
Research Co-ordination Meeting on Tracer Techniques in Studies on the Use of Non-protein Nitrogen (NPN) in Ruminants Alexandria, Egypt 1976.