1. W. M. Darley and B. E. Volcani,Exp. Cell Res. 58, 334–342 (1969).
2. M. Hildebrand, D. R. Higgens, K. Busser, and B. E. Volcani,Gene 132, 213–218 (1993).
3. A. G. Sangster and M. J. Hodson, Silica in higher plants nutrition, inSilicon Biochemistry, CIBA Foundation Symposium 121, John Wiley and Sons, New York, pp. 90–111 (1986).
4. E. M. Carlisle, Silicon as an essential trace element in animal nutrition, inSilicon Biochemistry, CIBA Foundation Symposium 121, John Wiley and Sons, New York, pp. 123–139 (1986).
5. E. M. Carlisle,Science 167, 279, 280 (1970).