1. Heinz, D. J., Krishnamurthi, M., Nickell, L. G. and Maretzki, A. (1977). Cell, tissue and organ culture in sugar cane improvement. In:Applied and fundamental aspects of plant cell, tissue and organ culture(Reinert, J. and Bajas, Y. P. S., Eds). Berlin, Springer-Verlag, 3–17.
2. McCullagh, P. and Nelder, J. A. (1989).Generalised linear models, 2nd Edition. Chapman and Hall, London.
3. Van der Zwet, T. and Keil, N. L. (1979). Fire blight—a bacterial disease of rosaceous plants.US Department of Agriculture Handbook,510. Government Printing Office, Washington, DC, USA.