1. Official methods of analysis;AOAC,1975
2. Protein quantity and quality for UK dairy cows;Broster,1981
3. Microdiffusion analysis and columetric error;Conway,1957
4. The relation of cellulose and lignin content to the nutritive value of animal feed;Crampton;J. Nutr.,1938
5. Ammonia treatment of straw for cattle production in intensive agrarian agriculture;Davis,1983