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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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Eng, R. Y. N., Tsujita, M. J., & Grodzinski, B. (1985). The effects of supplementary HPS lighting and carbon dioxide enrichment on the vegetative growth, nutritional status and flowering characteristics ofChrysanthemum morifoliumRamat. Journal of Horticultural Science, 60(3), 389–395.
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Clark, N. A. (1924). The Rate of Reproduction of Lemna Major as a Function of Intensity and Duration of Light. J. Phys. Chem., 29(8), 935–941.
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Lumsden, P. J., & Furuya, M. (1986). Evidence for Two Actions of Light in the Photoperiodic Induction of Flowering in <italic>Pharbitis nil</italic>. Plant and Cell Physiology, .
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Siemens, C. W. (1880). III. On the influence of electric light upon vegetation, and on certain physical principles involved. Abstr. Pap. Printed Phil. Trans. R. Soc. Lond., 30(200-205), 210–219.
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