FeatureGems & Gemology, Summer 2005, Volume 41, No. 2Emeralds from the Kafubu Area, ZambiaJ. C. (Hanco) Zwaan, Antonín V. Seifert, Stanislav Vrána, Brendan M. Laurs, Björn Anckar,William B. (Skip) Simmons, Alexander U. Falster, Wim J. Lustenhouwer, Sam Muhlmeister, John I. Koivula and Héja Garcia-Guillerminet六月 1, 2005下载 PDF 版本
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