BIBLIOGRAPHY

1. Gubelin E. J. The Emerald from Habachtal Gems & Gemology summer 1956 p. 295-309
2. Gubelin E. J. Emerald from Habachtal Journal of Gemology 1956 p.342-361
3. Grundmann G. and Morteani G. “Emerald mineralization during regional metamorphism: the Habachtal (Austria) and Leydsdorp (Transvaal, South Africa) deposits” Economic Geology vol. 84 p.1835-1849 1989 Sinkankas J. 1981 “Emeralds and other beryls” Pensylvania, Chilton Book Co. p.371-377