1. Bahr, G. F. & Golomb, H. M., 1971. Karyotyping of single human chromosomes from dry mass determined by electron microscopy. Proc. natn. Acad. Sci. U.S.A. 68: 726?730.
2. Berra, A. & Lopez González, G., 1982. Notas sueltas sobre el género Narcissus en España. Anales Jard. Bot. Madrid 29(1): 67?78.
3. Bennett, M. D., 1972. Nuclear DNA content and minimum generation time in herbaceous plants. Proc. R. Soc. Lond. B. 181: 109?135.
4. Bennett, M. D., 1982. Nucleotypic basis of spatial ordering of chromosomes in eukaryotes and the implications of the order for genome evolution and phenotypic variation. In: Genome Evolution. Academic Press. London, 239?261.
5. Dixon, W. J., Brown, M. B., Engelman, L., Frame, J. W., Hill, M. A., Jennrich, R. I. & Toporek, J. D. Eds. (1983), BMDP statistical Software. University of California Press. Berkeley, Los Angeles, London.