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Kadman-Zahavi, A., & Ephrat, E. (1982). The efficiency of different light sources in inducing spray carnation flowering. Scientia Horticulturae, 18, 159–167.
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Arnott, J. T. (1982). Growth Response of White and Englemann Spruce Seedlings to Extended Photoperiod Using Three Light Intensities.
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Edison, T. A. (1889). The dangers of electric lighting. The North American Review, 149(396), 625–634.
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Tyndall, J. (1879). The Electric Light. Fortnightly review, 25(146), 197–216.
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Croft, T. A. (1979). The brightness of lights on Earth at night, digitally recorded by DMSP satellite (Vol. 80-167).
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