Piepenbrink et al., 1998. J. Dairy Sci., 81 (4): 1046-1061

Piepenbrink, M. S. ; Schingoethe, D. J. ; Brouk, M. J. ; Stegeman, G. A., 1998. Systems to evaluate the protein quality of diets fed to lactating cows. J. Dairy Sci., 81 (4): 1046-1061