6Skorkowska- Zielenieveska, - J. In heavy tea and coffee drinkers"nutritional status" of fluoride in relation to that of other mineral elements [J]. Fluoride., 1983, 16:1,20-13.
7WHO. Fluorine and fluorides[J]. Environmental - Health - Criteria. 1984,, 36,136.
8Bilbeissi - MW, fraysse - C. Dental fluoisis in relation to tea drinking in Jordan Flucride[J], 1988,21(3) : 121-126.
9Cao - J, Bai - Y; Liu - J. Fluorsis induced by drin - king drick tea[J]. Fluorde. 1996,29(3):139-143.
10Cao - J, Zhao - Y, Liu - J.Brick tea consumption as the cause of dental fluorosis among children from Mongol, Kazak and Yugu populations in China[J]. Food - and - Chemical - Toxicogy, 1997,35(8) :827 - 833.
