1. Black, M., Shuttleworth, J.E.: The role of cotyledons in the photocontrol of hypocotyl extension in Cucumis sativus L. Planta 117, 57?66 (1974)
2. Brain, R.D., Freeberg, J.A., Weiss, C.V., Briggs, W.R.: Blue light-induced absorbance changes in membrane fractions from corn and Neurospora. Plant Physiol. 59, 948?952 (1977)
3. Proceedings of the 22nd Nottingham Easter School in Agricultural Sciences;W.R. Briggs,1975
4. Canham, A.E.: Some developments in growing room design. Stoneleigh Electricity Council Research Communication ECRC/R941 1975
5. Curry, G.M.: Phototropism. In: Physiology of Plant Growth and Development, pp. 243?273, Wilkins, M.B., ed. London: McGraw Hill 1969