8Ramaswamy Ravichandran. Carotenoid composition, distribution and degradation to flavour volatiles during black tea manufacture and the effect of carotenoid supplementation on tea quality and aroma[J]. Food Chemistry, Volume 78, Issue 1, July 2002, Pages 23-28.
9Owuor, P. O., Odchard, H. O. The response of quality and yeild of black tea of two Camellia sinensis varieties to methods and intervals of harvesting [J]. Sic. Food Agric, 1993, 62, 337-343.
10Obanda M, Ovcuor P O. Impact if shoot maturity on chlorophyll content, composion of volatile flavour compounds and plain black tea chemical quality parameters of colnal leaf [J]. Sic Food Agric,1995, 69: 529-534.
