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http://apps1.eere.energy.gov/buildings/publications/pdfs/ssl/energysavingsforecast14-summ.pdf
2. Evstratyeva, K. Market Overview for Global LED Industry: 2013–2018 (Strategies Unlimited/Pennwell, 2014).
3. McKinsey & Company Lighting the Way: Perspectives on the Global Lighting Market 2nd edn; (2012);
www.mckinsey.de/sites/mck_files/files/Lighting_the_way_Perspectives_on_global_lighting_market_2012.pdf
4. Losev, O. V. Telegrafiya i Telefoniya bez Provodov (transl. Wireless Telegraphy and Telephony) 44, 485–494 (1927).
5. Round, H. J. Electr. World 19, 309–310 (1907).