1. Darwin C., Power of Movement in Plants (Murray, London, 1880).
2. Went F. W., Rec. Trav. Bot. Ned.25, 1 (1928).
3. Uggla C., Moritz T., Sandberg G., Sandberg B, Proc. Natl. Acad. Sci. U.S.A.93, 9282 (1996);
4. Wolpert L., in The Molecular Basis of Positional Signalling, , Key R. and , Smith J., Eds. (Company Biology, Cambridge, UK, 1989), pp. 3-12;
5. Meinhardt H., in Positional Controls in Plant Development, , Barlow P. W. and , Carr D. J., Eds. (Cambridge Univ. Press, Cambridge, UK, 1984), pp. 1-32.