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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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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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Croft, T. A. (1979). The brightness of lights on Earth at night, digitally recorded by DMSP satellite (Vol. 80-167).
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Dickinson, L. G., Boselly, S. E., & Burgmann, W. S. (1974). Defense Meteorological Satellite Program (DMSP) – User's Guide (Vol. ADA007678).
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Kennard, D. C., & Chamberlin, V. D. (1931). All-night Light for Layers (Vol. Bulletin 476).
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