1. Åberg, B.: Physiologische und ökologische Studien über die pflanzliche Photomorphose. Symbolae bot. Upsaliensis8, 5–189 (1943).
2. Arthur, J. M.: Red pigment production in apples by means of artificial light sources. Contrib. Boyce Thompson Inst.4, 1–18 (1932).
3. : Radiation and anthocyanin pigments. In: Biological effects of radiation, B. M. Duggar, ed., Vol. II, p. 1109–1118. New York: McGraw-Hill 1936.
4. Borthwick, H. A., S. B. Hendricks andM. W. Parker: Action spectrum for inhibition of stem growth in dark-grown seedlings of albino and nonalbino barley (Hordeum vulgare). Bot. Gaz.113, 95–105 (1951).
5. : The reaction controlling floral initiation. Proc. Nat. Acad. Sci. U.S.A.38, 929–934 (1952).