FeatureGems & Gemology, Summer 2005, Volume 41, No. 2ザンビアのカフブ地方産のエメラルド (英語)J. 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-Guillerminet6月 1, 2005PDFをダウンロード
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