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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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Adams, J. (1924). Duration of Light and Growth. Annals of Botany, 38(151), 509–523.
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Adams, J. (1925). Some Further Experiments On The Relation Of Light To Growth. American Journal of Botany, 12(7), 398–412.
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