1. Abou-Zeid, A. A. & Shehata, Y. M. (1969) A simple technique for assaying antibiotics using methylene blue as an indicator.Indian J. Pharm. 31:72?75.
2. Bulinski, R. & Marzec, K. (1963) Vitamin C content in Polish canned vegetables.Lublin-Polonia Sect. D 18:499?500.
3. Campbell, J. A. (1961) Methology Evaluation, Nutrition Document, R.10/ Add. 37 WHO/FAO/UNICEF-PAG.
4. Miter, D. (1967) Composition of amino acids in different types of beets.Rastenienud. Nauki (Sofia), 4 (8):19?28.
5. Oser, B. L. (1965) Hawk's Physiological Chemistry (New York), 4th. ed., Appendix III, 1354?1355.