1. Bennett, M. D., andRees, H., 1969: Induced and developmental variation in chromosomes of meristematic cells. Chromosoma27, 226?244.
2. - andSmith, J. B., 1976: DNA amounts in Angiosperms. Phil. Trans. Roy. Soc. Lond. (in press).
3. Conger, A. D., andFairchild, L. M., 1953: A quick-freeze method for making smear slides permanent. Stain Technol.28, 281?283.
4. Evans, G. M., Rees, H., Snell, C. L., andSun, S., 1972: The relationship between nuclear DNA amount and the duration of the mitotic cycle. Chromosomes Today3, 24?31.
5. Halkka, O., 1964: A photometric study of theLuzula problem. Hereditas52, 81?88.