1. Ames JW, Boltz GE (1917) Ohio Agric Exp Sta Bull 318, Wooster OH
2. Ames JW, Boltz GE, Stenius JA (1912) Ohio Agric Exp Sta Bull 243, Wooster, OH, pp 565?587
3. Andrews JS, Boyd HM, Terry DE (1942) Cereal Chem 19, 55
4. AOAC (1975) ?Official Methods of Analysis? 12th edn, Horowitz W, Ed. Assoc. of Official Analytical Chemists, Washington DC
5. Bains GS (1953) Cereal Chem 30, 139