Gaillou, Eloïse, Delaunay, Aurélien, Rondeau, Benjamin, Bouhnik-le-Coz, Martine, Fritsch, Emmanuel, Cornen, Guy, Monnier, Christophe (2008) The geochemistry of gem opals as evidence of their origin. Ore Geology Reviews, 34 (1) 113-126 doi:10.1016/j.oregeorev.2007.07.004

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	Benjamin Rondeau, Bénédicte Cenki-Tok, Emmanuel Fritsch, Francesco Mazzero, Jean-Pierre Gauthier, Yves Bodeur, Eyassu Bekele, Eloïse Gaillou and Dereje Ayalew (2012) Geochemical and petrological characterization of gem opals from Wegel Tena, Wollo, Ethiopia: opal formation in an Oligocene soil. Geochemistry: Exploration, Environment, Analysis, 12, 93-104, 28 May 2012
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	Fritsch, Emmanuel, Gaillou, Eloïse, Ostroumov, Mikhail, Rondeau, Benjamin, Devouard, Bertrand, Barreau, Alain (2004) Relationship between nanostructure and optical absorption in fibrous pink opals from Mexico and Peru. European Journal of Mineralogy, 16 (5) 743-751 doi:10.1127/0935-1221/2004/0016-0743
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	Chauviré, Boris, Valentin Mollé, Florine Guichard, Benjamin Rondeau, Paul Stephen Thomas, and Emmanuel Fritsch. 2023. "Cracking of Gem Opals" Minerals 13, no. 3: 356. https://doi.org/10.3390/min13030356
	Rondeau, Benjamin, Fritsch, Emmanuel, Mazzero, Francesco, Gauthier, Jean-Pierre, Cenki-Tok, Bénédicte, Bekele, Eyassu, Gaillou, Eloïse (2010) Play-of-Color Opal from Wegel Tena, Wollo Province, Ethiopia. Gems & Gemology, 46 (2) 90-105 doi:10.5741/gems.46.2.90
	Rondeau, Benjamin, Fritsch, Emmanuel, Guiraud, Michel, Renac, Christophe (2004) Opals from Slovakia ("Hungarian" opals): a re-assessment of the conditions of formation. European Journal of Mineralogy, 16 (5) 789-799 doi:10.1127/0935-1221/2004/0016-0789
	Graham, Ian T., Zaw, Khin, Cook, Nigel J. (2008) The genesis of gem deposits. Ore Geology Reviews, 34 (1) 1-2 doi:10.1016/j.oregeorev.2008.04.001
	Rondeau, Benjamin, Gauthier, Jean-Pierre, Mazzero, Francesco, Fritsch, Emmanuel, Bodeur, Yves, Chauvire, Boris (2013) On the Origin of Digit Patterns in Gem Opal. Gems & Gemology, 49 (3) doi:10.5741/gems.49.3.138
	GAILLOU, Eloïse (2012) Blog about Ethiopian opals. https://www.mindat.org/article.php/1582/Blog+about+Ethiopian+opals