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Ballaré, CL; Scopel, AL; Sánchez, RA. Far-red radiation reflected from adjacent leaves: an early signal of competition in plant canopies.. Science. 1990-01-19, 247 (4940): 329–32. PMID 17735851. doi:10.1126/science.247.4940.329.
Christie, JM; Reymond, P; Powell, GK; Bernasconi, P; Raibekas, AA; Liscum, E; Briggs, WR. Arabidopsis NPH1: a flavoprotein with the properties of a photoreceptor for phototropism.. Science. 1998-11-27, 282 (5394): 1698–701. PMID 9831559. doi:10.1126/science.282.5394.1698.