1. Atkin, J. D.: Genetic and cytological studies of the hybrid Allium cepa x A. ascalonicum. Unpublished thesis, University of California 1953 (Cited from Jones, H. A., Mann, L. K.: Onions and their Allies. London: Leonard Hill 1963)
2. Battaglia, E.: Allium asoalonicum L., A. fistulosum L., A. cepa L.: analisi cariotipica. Caryologia (Firenze) 10, 1?28 (1957)
3. Bothmer, R. von: Cytological studies in Allium. I. Chromosome numbers and morphology in sect. Allium from Greece. Bot. Notiser 123, 519?551 (1970)
4. Brat, S.V.: Genetic systems in Allium. I. Chromosome variation. Chromosoma (Berl.) 16, 486?499 (1965)
5. Cochran, F. D.: Cytogenetic studies of the species hybrid Allium fistulosum x Allium ascalonicum and its backcross progenies. Univ. Stud. La., Biol. Ser. 2, 1?170 (1953)