1. Armstrong, S. J. and Ford-Lloyd, B. V., Cytogenetic studies of species in section Cepa: barriers to pairing and gene exchange in interspecies hybrids, Proc. 4th Eucarpia Allium Symp. 121, 1988.
2. Astley, D., Abstracts, Symp. Genus Allium — Taxonomic Problems and Genetic Resources, Gatersleben, 1991.
3. Genetic resources of Allium species;Astley,1982
4. The organisation, nucleotide sequence and chromosomal distribution of a satellite DNA from Allium cepa;Barnes;Chromosoma,1985
5. Bozzini, A., On the karyotype of a viviparous onion known as A. cepa L. var. viviparum (Metzg.), Caryologia 17, 459.