1. AOAC 1984 Official Methods of Analysis of the Association of Official Analytical Chemists (14th edn.) Association of Official Analytical Chemists, Washington, DC, USA.
2. ARC 1981 The Nutrient Requirements of Pigs. Agricultural Research Council, Commonwealth Agricultural Bureaux, Slough, Berkshire, UK.
3. Utilization of ileal digestible amino acids by growing pigs: Effect of dietary lysine concentration on efficiency of lysine retention
4. 1969 Amino Acid Analyses Model 121 M: Operating Manual. Spinco Division of Beckman Instruments, Palo Alto, CA, USA.