1. Allaway, W.G. and G. Setterfield, 1972. Ultrastructural observations on guard cells of Vicia faba and Allium porrum. Can. J. Bot. 50: 1405–1413.
2. Blakeslee, A.F., J. Belling, M.E. Farnham and A.D. Bergner, 1922. A haploid mutant in the Jimson weed, Datura stramonium. Science 55: 646–647.
3. Bohanec, B., M. Jakge, A. Ihan and B. Javornik, 1995. Studies of gynogenesis in onion (Allium cepa L.): induction procedures and genetic analysis of regenerants. Plant Sci. 104: 215–224.
4. Borisenko, V.A., V.D. Turkov and S.Y. Kraevoi, 1971. The use of induced parthenogenesis and polyembryony in the production of haploid forms of vegetable plants (Russ). In: V.S. Moshaeva and S.Y. Kraevoi (Eds.), Prakticheskie Zadachi Genetiki v Sel’skom Xoziajstve, pp. 141–148. Nauka, Moscow.
5. Butterfaß, T.H., 1959. Ploidie und Chloroplastenzahlen. Ber. Deutsch. Bot. Ges. 72: 440–451. Campion, B., 1994. Production of doubled haploid lines of onion (Allium cepa L.) through in vitro gynogenesis. In: Abstr. VIIIth Intl. Congr. Plant Tissue Cell Cult., Florence, June 12–17, 1994, p. 92.