1. Birch, G.G., Bointon, B.M., Rolfe, E.J. & Selman,J.D. (1974): Quality changes related to vitamin C in fruit juice and vegetable processing. In Vitamin C — recent aspects of its physiological and technological importance, ed G.G. Birch and KJ. Parker, pp 40-48. Essex: Applied Science Publishers.
2. Strohecker, R. & Henning, H.M. (1965): Vitamin assay — tested methods, 2nd edn, pp 242-244. Munich: Verlag Chemic.
3. Walter, C.L. (1974): Vitamin C and nitrosamine formation. In Vitamin C — recent aspects of its physiological and technological importance, ed G.G. Birch and KJ. Parker, pp 78-79. Essex: Applied Science Publishers Ltd.