1. 1. Schildknecht, H. (1983) Angew. Chem. Int. Ed. Engl. 22, 695–710
2. 2. Bünning, E. (1973) The Physiological Clock, 3rd Ed., English University Press, London.
3. Darwin, C. (1882) The Power of Movement in Plants Third Thousand., John Murray, London.
4. 4. Satter, R. L., Gorton, H. L., and Vogelmann, T. C. (1990) The Pulvinus: Motor Organ for Leaf Mobement., American Society of Plant Physiologists.
5. Chemistry and Biology of Plant Leaf Movements