1. A. V. Naumov, “Survey of the international gallium market. The economics of gallium,” Izv. Vyssh. Uchebn. Zaved. Tsvetn. Met., No. 3, 14–21 (2005).
2. Jin Nie, “Current climate and future prospects for the gallium market,” Proc. Electronic Metals Conf., Guanzhou, Sept. 2012, www.conferences.metal-pages.com/papers/electronic-metals-2012/ .
3. Jue Zhang, “Gallium arsenide industry development study,” ibid.
4. U. S. Geological Survey Publications, annual, www.usgs.gov.us .
5. Survey of the Market for Non-Silicon-Based Photovoltaic Solar Elements and Materials for Their Production in the World [in Russian], Infomine Research Group, Moscow (2011).