1. Fluorine;Allman,1978
2. Significance of fluoride in Tanzanian waters;Bugaisa;Mineral. Res. Div. Rep. SLB/5,1969
3. Distribution and formation of high-fluorine ground water in China;Fuhong;Environ. Geol. Sci.,1988
4. Fluorine contents of volcanic rocks in the Rift Zone of East Africa;Gerasimovsky;Geochem. Int.,1969
5. Fluorine. Part 9-a-9;Greenland,1966