B. B. Kelly, V. E. Becker, Effects of Light Intensity and Temperature on Nitrogen Fixation by Lobaria pulmonaria, Sticta weigelii, Leptogium cyanescens and Collema subfurvum, The Bryologist, Vol. 78, No. 3 (Autumn, 1975), pp. 350-355
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Kelly et al. (1975) studied this question.
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